Electromagnetic effects — Paper 1 · IGCSE Physics 0625

9 What is designed to change electrical energy into kinetic energy? A capacitor B generator C motor D transformer

1 marks

Answer: C

This question in 0625/11 May/June 2005

34 Which graph shows the output voltage from a simple a.c. generator? voltage A 0 time voltage B 0 time voltage C 0 time voltage D 0 time

1 marks

Answer: D

This question in 0625/11 May/June 2005

35 A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An a.c. voltage of 25.0 V is connected across the primary coil. 25.0 V primary coil secondary coil 50 turns 100 turns What is the voltage across the secondary coil? A 12.5 V B 50.0 V C 175 V D 200 V

1 marks

Answer: B

This question in 0625/11 May/June 2005

36 Two circuits are set up as shown. The iron rods are placed close together, and are free to move. S iron rod iron rod X What happens to the size of the gap at X when switch S is closed? A It decreases. B It decreases then increases. C It increases. D It does not change.

1 marks

Answer: A

This question in 0625/11 May/June 2005

37 The diagram shows a simple cathode-ray tube. Which part emits the electrons? – + D A B C

1 marks

Answer: B

This question in 0625/11 May/June 2005

34 Which arrangement may be used to step up a voltage? A iron core B iron core a.c. d.c. output output input input C iron core D iron core a.c. d.c. output output input input

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2005

35 The diagrams show a straight wire carrying a current into the paper. Which diagram shows the magnetic field pattern due to this current? A B C D wire wire wire wire

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2005

36 A magnet is suspended from a spring so that it can move freely inside a coil which is connected to a sensitive centre-zero ammeter. spring N centre-zero ammeter S What does the ammeter show when the magnet vibrates slowly up and down? A a reading constantly changing from left to right and right to left B a steady reading to the left C a steady reading to the right D a steady zero reading

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2005

27 From which materials are the coil and the core of an electromagnet made? coil core A copper copper B copper iron C iron copper D iron iron

1 marks

Answer: B

This question in 0625/11 May/June 2006

35 A current-carrying coil in a magnetic field experiences a turning effect. variable power supply N S How can the turning effect be increased? A increase the number of turns on the coil B reduce the size of the current C reverse the direction of the magnetic field D use thinner wire for the coil

1 marks

Answer: A

This question in 0625/11 May/June 2006

36 A transformer is to be used to produce a 6 V output from a 24 V input. coil X coil Y 24 V 6 V What are suitable numbers of turns for coil X and for coil Y? number of turns number of turns on coil X on coil Y A 240 60 B 240 240 C 240 960 D 960 60

1 marks

Answer: A

This question in 0625/11 May/June 2006

37 A cathode-ray tube has an anode and an earthed cathode. Which line in the table shows the charge and the temperature of the anode? anode charge anode temperature A negative cool B negative hot C positive cool D positive hot

1 marks

Answer: C

This question in 0625/11 May/June 2006

26 A strong electromagnet is used to attract pins. core pins coil What happens when the current in the coil is halved? A No pins are attracted. B Fewer pins are attracted. C The same number of pins is attracted. D Many more pins are attracted.

1 marks

Answer: B

This question in 0625/11 May/June 2007

31 The circuit contains a relay. relay lamp 2 switch S lamp 1 When switch S is closed, what is the state of the lamps? lamp 1 lamp 2 A on on B on off C off on D off off

1 marks

Answer: A

This question in 0625/11 May/June 2007

35 A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope, which shows a graph of voltage output against time. N S oscilloscope contact contact Which graph shows the voltage output against time? A B C D

1 marks

Answer: A

This question in 0625/11 May/June 2007

36 The diagram shows a lamp connected to a transformer. 40 turns 200 turns 12 V a.c. What is the potential difference across the lamp? A 2.4 V B 12 V C 60 V D 240 V

1 marks

Answer: C

This question in 0625/11 May/June 2007

26 Which materials are suitable for making a permanent magnet and the core of an electromagnet? permanent magnet core of an electromagnet A iron iron B iron steel C steel iron D steel steel

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2007

35 How is electricity transmitted over large distances and why is it transmitted in this way? how why A at high voltage for safety B at high voltage to reduce energy loss C at low voltage for safety D at low voltage to reduce energy loss

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2007

36 Which parts of an a.c. generator slide past each other when the generator is working? A brushes and coil B coil and magnets C magnets and slip rings D slip rings and brushes

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2007

37 The diagram shows a cathode-ray tube. electron top beam screen Y2 X2 heater Y1 X1 cathode anode Y-plates X-plates bottom What must be done to deflect the electron beam upwards? A make X1 more positive than X2 B make X2 more positive than X1 C make Y1 more positive than Y2 D make Y2 more positive than Y1

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2007

28 A solenoid carrying a current is used to demagnetise a bar magnet. solenoid bar magnet power supply Which conditions achieve demagnetisation? current through movement of bar magnet solenoid A a.c. around the solenoid quickly B a.c. through the solenoid slowly C d.c. around the solenoid quickly D d.c. through the solenoid slowly

1 marks

Answer: B

This question in 0625/11 May/June 2008

34 The wire XY shown in the diagram is connected to a sensitive voltmeter with a centre zero. XY is then moved quickly once through the magnetic field. X S N V movement Y What is observed on the voltmeter? A The needle moves briefly in one direction and then returns to the centre. B The needle moves quickly in one direction and stays deflected. C The needle vibrates rapidly from side to side whilst XY is moving. D The needle stays still.

1 marks

Answer: A

This question in 0625/11 May/June 2008

35 The diagram shows a transformer connected to a 240 V a.c. supply. soft-iron core primary coil secondary coil 60 turns 30 turns 240 V a.c. What is the potential difference across the secondary coil of the transformer? A 30 V B 120 V C 240 V D 480 V

1 marks

Answer: B

This question in 0625/11 May/June 2008

34 Two different systems are used to transmit equal amounts of electrical power from one building to another. One system uses low voltage and the other uses high voltage. Both systems use identical wires. Which line in the table is correct about which system wastes least energy and why? least energy wasted why A high voltage system the current in the wires is bigger B high voltage system the current in the wires is smaller C low voltage system the current in the wires is bigger D low voltage system the current in the wires is smaller

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2008

35 When the electric current in wire XY is in the direction shown, there is an upward force on the wire. X current force magnet magnet N S Y If the north and south poles of the magnet exchange positions, in which direction will the force on the wire act? A downwards B upwards C to the left D to the right

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2008

34 A wire perpendicular to the page carries an electric current in a direction out of the page. There are four compasses near the wire. Which compass shows the direction of the magnetic field caused by the current? B A C wire with current out of page D

1 marks

Answer: C

This question in 0625/11 May/June 2009

35 A transformer has 50 turns on its primary coil and 100 turns on its secondary coil. An alternating voltage of 25.0 V is connected across the primary coil. 25.0 V primary coil secondary coil 50 turns 100 turns What is the voltage across the secondary coil? A 12.5 V B 50.0 V C 175 V D 200 V

1 marks

Answer: B

This question in 0625/11 May/June 2009

36 In a cathode-ray tube, a hot tungsten cathode releases particles by thermionic emission. What are these particles? A α-particles B electrons C protons D tungsten atoms

1 marks

Answer: B

This question in 0625/11 May/June 2009

37 The diagram shows a cathode-ray tube. cathode anode top Y plate P screen bottom Y plate A student wants the cathode rays to make a spot at P on the screen. Which parts of the cathode-ray tube should be positive? A anode and top Y plate B anode and bottom Y plate C cathode and top Y plate D cathode and bottom Y plate

1 marks

Answer: A

This question in 0625/11 May/June 2009

34 Which device is designed to allow a small direct current (d.c.) to control a large direct current (d.c.)? A a generator B a motor C a relay D a transformer

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2009

35 A transformer is to be used to provide a 10 V output from a 100 V supply. 100 V 10 V primary coil secondary coil What are suitable numbers of turns for the primary coil and for the secondary coil? number of turns on number of turns on the primary coil the secondary coil A 100 1000 B 200 110 C 400 490 D 800 80

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2009

33 Which device is designed to allow a small direct current (d.c.) to control a large direct current (d.c.)? A a generator B a motor C a relay D a transformer

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2009

37 A transformer is to be used to provide a 10 V output from a 100 V supply. 100 V 10 V primary coil secondary coil What are suitable numbers of turns for the primary coil and for the secondary coil? number of turns on number of turns on the primary coil the secondary coil A 100 1000 B 200 110 C 400 490 D 800 80

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2009

27 A piece of iron and a piece of steel are picked up by an electromagnet as shown. electromagnet N S steel iron The current to the electromagnet is switched off. What happens? A Both the iron and the steel remain magnetised. B Neither the iron nor the steel remain magnetised. C Only the iron remains magnetised. D Only the steel remains magnetised.

1 marks

Answer: D

This question in 0625/11 May/June 2010

34 A coil is connected to a battery and a soft iron bar is hung near to it. soft iron coil The current is then reversed by reversing the battery connections. How does the soft iron bar behave in the two cases? with the battery as shown with the battery reversed A attracted to the coil attracted to the coil B attracted to the coil repelled from the coil C repelled from the coil attracted to the coil D repelled from the coil repelled from the coil

1 marks

Answer: A

This question in 0625/11 May/June 2010

35 A transformer has 15 000 turns on its primary coil and 750 turns on its secondary coil. Connected in this way, for what purpose could this transformer be used? A to convert the 8000 V a.c. output of a power station to 160 000 V for long-distance power transmission B to convert the 160 000 V d.c. supply from a power line to 8000 V for local power transmission C to use a 12 V d.c. supply to operate a 240 V razor D to use a 240 V a.c. mains supply to operate a 12 V motor

1 marks

Answer: D

This question in 0625/11 May/June 2010

27 A coil is connected to a battery and a soft iron bar is hung near to it. soft iron coil The current is then reversed by reversing the battery connections. How does the soft iron bar behave in the two cases? with the battery as shown with the battery reversed A attracted to the coil attracted to the coil B attracted to the coil repelled from the coil C repelled from the coil attracted to the coil D repelled from the coil repelled from the coil

1 marks

Answer: A

This question in 0625/12 May/June 2010

33 A transformer has 15 000 turns on its primary coil and 750 turns on its secondary coil. Connected in this way, for what purpose could this transformer be used? A to convert the 8000 V a.c. output of a power station to 160 000 V for long-distance power transmission B to convert the 160 000 V d.c. supply from a power line to 8000 V for local power transmission C to use a 12 V d.c. supply to operate a 240 V razor D to use a 240 V a.c. mains supply to operate a 12 V motor

1 marks

Answer: D

This question in 0625/12 May/June 2010

10 Which of these is designed to change electrical energy into kinetic energy? A a capacitor B a generator C a motor D a transformer

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2010

35 A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope. N S oscilloscope contact contact Which graph shows the output voltage V against time t ? A B C D V V V V t t t t

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2010

36 A village has to be supplied with electricity from a power station that is a long way from the village. Which type of current should be used, and at which voltage? type of current voltage A alternating current high voltage B alternating current low voltage C direct current high voltage D direct current low voltage

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2010

25 Which of these is designed to change electrical energy into kinetic energy? A a capacitor B a generator C a motor D a transformer

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2010

35 A village has to be supplied with electricity from a power station that is a long way from the village. Which type of current should be used, and at which voltage? type of current voltage A alternating current high voltage B alternating current low voltage C direct current high voltage D direct current low voltage

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2010

36 A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope. N S oscilloscope contact contact Which graph shows the output voltage V against time t ? A B C D V V V V t t t t

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2010

13 Which of these is designed to change electrical energy into kinetic energy? A a capacitor B a generator C a motor D a transformer

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2010

33 A coil is rotated steadily between the poles of a magnet. The coil is connected to an oscilloscope. N S oscilloscope contact contact Which graph shows the output voltage V against time t ? A B C D V V V V t t t t

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2010

36 A village has to be supplied with electricity from a power station that is a long way from the village. Which type of current should be used, and at which voltage? type of current voltage A alternating current high voltage B alternating current low voltage C direct current high voltage D direct current low voltage

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2010

33 Which graph shows how the output voltage varies with time for a simple a.c. generator? A B voltage voltage 0 0 time time C D voltage voltage 0 0 time time

1 marks

Answer: C

This question in 0625/11 May/June 2011

34 A magnet is suspended from a spring so that it can move freely inside a coil. The coil is connected to a sensitive centre-zero ammeter. spring moving magnet N centre-zero ammeter stationary coil S What does the ammeter show when the magnet repeatedly moves slowly up and down? A a reading constantly changing from left to right and right to left B a steady reading to the left C a steady reading to the right D a steady reading of zero

1 marks

Answer: A

This question in 0625/11 May/June 2011

35 The diagram shows a simple step-down transformer used to decrease a voltage. Which part is the primary coil? A B C D

1 marks

Answer: D

This question in 0625/11 May/June 2011

32 A magnet is suspended from a spring so that it can move freely inside a coil. The coil is connected to a sensitive centre-zero ammeter. spring moving magnet N centre-zero ammeter stationary coil S What does the ammeter show when the magnet repeatedly moves slowly up and down? A a reading constantly changing from left to right and right to left B a steady reading to the left C a steady reading to the right D a steady reading of zero

1 marks

Answer: A

This question in 0625/12 May/June 2011

33 Which graph shows how the output voltage varies with time for a simple a.c. generator? A B voltage voltage 0 0 time time C D voltage voltage 0 0 time time

1 marks

Answer: C

This question in 0625/12 May/June 2011

34 The diagram shows a simple step-down transformer used to decrease a voltage. Which part is the primary coil? A B C D

1 marks

Answer: D

This question in 0625/12 May/June 2011

32 A magnet is suspended from a spring so that it can move freely inside a coil. The coil is connected to a sensitive centre-zero ammeter. spring moving magnet N centre-zero ammeter stationary coil S What does the ammeter show when the magnet repeatedly moves slowly up and down? A a reading constantly changing from left to right and right to left B a steady reading to the left C a steady reading to the right D a steady reading of zero

1 marks

Answer: A

This question in 0625/13 May/June 2011

33 Which graph shows how the output voltage varies with time for a simple a.c. generator? A B voltage voltage 0 0 time time C D voltage voltage 0 0 time time

1 marks

Answer: C

This question in 0625/13 May/June 2011

34 The diagram shows a simple step-down transformer used to decrease a voltage. Which part is the primary coil? A B C D

1 marks

Answer: D

This question in 0625/13 May/June 2011

35 Which graph shows how the voltage of a simple a.c. generator varies with time? A B voltage voltage 0 0 0 0 time time C D voltage voltage 0 0 0 0 time time

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2012

36 The diagram shows a wire in the magnetic field between two poles of a magnet. magnet N S wire The current in the wire repeatedly changes between a constant value in one direction and a constant value in the opposite direction. This is shown on the graph. current 00 time What is the effect on the wire? A The force on the wire alternates between one direction and the opposite direction. B The force on the wire is constant in size and direction. C There is no force acting on the wire at any time. D There is only a force on the wire when the current reverses.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2012

32 Which graph shows how the voltage of a simple a.c. generator varies with time? A B voltage voltage 0 0 0 0 time time C D voltage voltage 0 0 0 0 time time

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2012

33 Some electrical devices require a magnet which may be switched on and off many times in a second. Which type of magnet may be used? A an electromagnet only B a permanent magnet only C either a permanent magnet or an electromagnet D neither a permanent magnet nor an electromagnet

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2012

35 The diagram shows a wire in the magnetic field between two poles of a magnet. magnet N S wire The current in the wire repeatedly changes between a constant value in one direction and a constant value in the opposite direction. This is shown on the graph. current 00 time What is the effect on the wire? A The force on the wire alternates between one direction and the opposite direction. B The force on the wire is constant in size and direction. C There is no force acting on the wire at any time. D There is only a force on the wire when the current reverses.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2012

31 A relay allows a small current in one circuit to control a different circuit. Which type of force is produced by the small current to activate the relay? A electrical B frictional C gravitational D magnetic

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2012

35 Which graph shows how the voltage of a simple a.c. generator varies with time? A B voltage voltage 0 0 0 0 time time C D voltage voltage 0 0 0 0 time time

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2012

36 In the construction of a transformer, which items must be included? A an iron core and a permanent magnet B an iron core and two coils of wire C a steel core and a permanent magnet D a steel core and two coils of wire

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2012

27 Two soft-iron rods are placed end to end inside a coil which is connected to a battery. coil soft-iron rod soft-iron rod The connections from the battery to the coil are now reversed. What happens to the soft-iron rods in each case? battery connections battery connections as shown reversed A rods attract rods attract B rods attract rods repel C rods repel rods attract D rods repel rods repel

1 marks

Answer: A

This question in 0625/11 May/June 2013

35 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses, together with one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an alternating current C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an alternating current

1 marks

Answer: C

This question in 0625/11 May/June 2013

36 The diagram shows a mains transformer that has an output voltage of 12 V. coil with soft-iron core 1000 turns 240 V a.c. 12 V a.c. input output How many turns of wire are in the secondary coil? A 12 B 20 C 50 D 20 000

1 marks

Answer: C

This question in 0625/11 May/June 2013

37 The diagram shows an experiment to demonstrate electromagnetic induction. X A wire N S Y X and Y are joined, in turn, by four wires, each made of a different material. Each wire is then moved quickly downwards between the magnets. Which material will not give rise to an induced current in the wire? A aluminium B copper C iron D nylon

1 marks

Answer: D

This question in 0625/11 May/June 2013

26 An electromagnet is used to separate magnetic metals from non-magnetic metals. Why is steel not suitable as the core of the electromagnet? A It forms a permanent magnet. B It has a high density. C It has a high thermal capacity. D It is a good conductor of electricity.

1 marks

Answer: A

This question in 0625/12 May/June 2013

35 A student wants to make a transformer to step 12 V down to 6.0 V. She winds 60 turns of wire around an iron core as shown in the diagram. soft-iron core 12 V a.c. 6.0 V a.c. primary coil secondary coil 60 turns How many turns of wire should she wind on the secondary coil of her transformer? A 5 B 30 C 60 D 120

1 marks

Answer: B

This question in 0625/12 May/June 2013

36 A toy railway engine is driven around a track by a d.c. electric motor. How can the speed of the motor be increased? A Use a motor made with fewer turns of wire. B Use a smaller d.c. voltage. C Use a stronger magnet in the motor. D Use the supply with its connections reversed.

1 marks

Answer: C

This question in 0625/12 May/June 2013

37 The diagram shows an experiment to demonstrate electromagnetic induction. X A wire N S Y X and Y are joined, in turn, by four wires, each made of a different material. Each wire is then moved quickly downwards between the magnets. Which material will not give rise to an induced current in the wire? A aluminium B copper C iron D nylon

1 marks

Answer: D

This question in 0625/12 May/June 2013

25 Two soft-iron rods are placed end to end inside a coil which is connected to a battery. coil soft-iron rod soft-iron rod The connections from the battery to the coil are now reversed. What happens to the soft-iron rods in each case? battery connections battery connections as shown reversed A rods attract rods attract B rods attract rods repel C rods repel rods attract D rods repel rods repel

1 marks

Answer: A

This question in 0625/13 May/June 2013

35 The diagram shows a mains transformer that has an output voltage of 12 V. coil with soft-iron core 1000 turns 240 V a.c. 12 V a.c. input output How many turns of wire are in the secondary coil? A 12 B 20 C 50 D 20 000

1 marks

Answer: C

This question in 0625/13 May/June 2013

36 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses, together with one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an alternating current C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an alternating current

1 marks

Answer: C

This question in 0625/13 May/June 2013

38 The diagram shows an experiment to demonstrate electromagnetic induction. X A wire N S Y X and Y are joined, in turn, by four wires, each made of a different material. Each wire is then moved quickly downwards between the magnets. Which material will not give rise to an induced current in the wire? A aluminium B copper C iron D nylon

1 marks

Answer: D

This question in 0625/13 May/June 2013

33 The circuit shown contains a relay. Both lamps are initially off. lamp 2 switch S relay lamp 1 When switch S is closed, the relay operates. What is the state of the lamps? lamp 1 lamp 2 A on on B on off C off on D off off

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2013

35 Which diagram shows a movement that will not produce the changing magnetic field needed to induce an e.m.f. in the coil? N S A moving a magnet and a coil towards each other at the same speed N S moving a magnet and a coil in the same direction B at the same speed N S C moving a magnet away from a fixed coil N S D moving a coil away from a fixed magnet

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2013

36 The diagram shows a simple d.c. electric motor which is rotating. coil magnet S N magnet Which change will make the motor rotate more quickly? A increasing the number of turns on the coil B removing the magnets C reversing the battery D reversing the polarity of the magnets

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2013

37 A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1000 B 240 48 000 C 480 24 D 2000 100

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2013

32 The circuit shown contains a relay. Both lamps are initially off. lamp 2 switch S relay lamp 1 When switch S is closed, the relay operates. What is the state of the lamps? lamp 1 lamp 2 A on on B on off C off on D off off

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2013

34 Which diagram shows a movement that will not produce the changing magnetic field needed to induce an e.m.f. in the coil? N S A moving a magnet and a coil towards each other at the same speed N S moving a magnet and a coil in the same direction B at the same speed N S C moving a magnet away from a fixed coil N S D moving a coil away from a fixed magnet

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2013

36 A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1000 B 240 48 000 C 480 24 D 2000 100

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2013

37 The diagram shows a simple d.c. electric motor which is rotating. coil magnet S N magnet Which change will make the motor rotate more quickly? A increasing the number of turns on the coil B removing the magnets C reversing the battery D reversing the polarity of the magnets

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2013

33 The circuit shown contains a relay. Both lamps are initially off. lamp 2 switch S relay lamp 1 When switch S is closed, the relay operates. What is the state of the lamps? lamp 1 lamp 2 A on on B on off C off on D off off

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2013

35 The diagram shows a transformer. core wire coil Which materials are suitable to use in its construction? core wire coil A copper iron B iron copper C steel copper D steel iron

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2013

36 The direction of the current flowing in a straight wire X is into the paper. Which diagram shows the shape of the magnetic field pattern around the wire? A B C D X X X X

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2013

37 A metal rod PQ rests on two horizontal metal wires that are attached to a battery. The rod lies between the poles of a magnet. magnet N Q metal rod P S magnet When the switch is closed, the rod moves to the right. What could be changed so that the rod moves to the left? A Open the switch. B Reverse the battery terminals and exchange the poles of the magnet. C Reverse the battery terminals but without exchanging the poles of the magnet. D Turn the metal rod around (P and Q exchanged).

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2013

34 An electric current is passed through a coil of wire. coil of wire Which diagram shows the shape of the magnetic field produced in the middle of the coil? A B C D

1 marks

Answer: A

This question in 0625/11 May/June 2014

35 When a wire is moved upwards between the poles of a magnet, an electromotive force (e.m.f.) is induced across the ends of the wire. motion of wire S N wire Which device uses a moving wire to induce an e.m.f.? A a cathode-ray tube B a generator C a transformer D an electromagnet

1 marks

Answer: B

This question in 0625/11 May/June 2014

36 An input voltage of 10 V is supplied to the primary coil of a transformer. An output voltage of 40 V is produced across the secondary coil. The 10 V supply at the primary coil is now replaced with a 40 V supply. What is the new output voltage across the secondary coil? A 10 V B 40 V C 70 V D 160 V

1 marks

Answer: D

This question in 0625/11 May/June 2014

35 A metal wire is placed between the poles of a magnet. The wire can be moved in each of three directions OP, QR and ST. metal wire O R N pole S pole S T Q P In which direction or directions must the wire be moved to induce an e.m.f. across the ends of the wire? A OP only B OP or ST C QR D ST only

1 marks

Answer: A

This question in 0625/12 May/June 2014

36 A transformer has 100 turns on its primary coil and 25 turns on its secondary coil. The primary coil is connected to a 12 V a.c. supply. 100 25 turns turns primary coil 12 V secondary coil What is the voltage induced across the secondary coil? A 3.0 V B 4.0 V C 48 V D 300 V

1 marks

Answer: A

This question in 0625/12 May/June 2014

34 When a wire is moved upwards between the poles of a magnet, an electromotive force (e.m.f.) is induced across the ends of the wire. motion of wire S N wire Which device uses a moving wire to induce an e.m.f.? A a cathode-ray tube B a generator C a transformer D an electromagnet

1 marks

Answer: B

This question in 0625/13 May/June 2014

35 An electric current is passed through a coil of wire. coil of wire Which diagram shows the shape of the magnetic field produced in the middle of the coil? A B C D

1 marks

Answer: A

This question in 0625/13 May/June 2014

36 An input voltage of 10 V is supplied to the primary coil of a transformer. An output voltage of 40 V is produced across the secondary coil. The 10 V supply at the primary coil is now replaced with a 40 V supply. What is the new output voltage across the secondary coil? A 10 V B 40 V C 70 V D 160 V

1 marks

Answer: D

This question in 0625/13 May/June 2014

27 A permanent magnet is made from metal and an electromagnet uses a metal core. Which metal is suitable for each of these purposes? permanent core of magnet electromagnet A iron iron B iron steel C steel iron D steel steel

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2014

34 The diagram shows cables used in the transmission of electrical energy. High voltages are used for the transmission. transmission cables power station Why are high voltages used for the transmission of electrical energy? A Fear of high voltages stops people from interfering with the cables. B Heat loss in the cables is smaller than if low voltages are used. C High voltages increase the current in the cables. D High voltages produce large magnetic fields, so less insulation is needed.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2014

35 Which diagram shows the magnetic field pattern around a wire that is carrying a current perpendicular to the page? A B C D wire wire

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2014

36 The diagram shows a simple transformer with an input of 240 V and an output of 40 V. There are 600 turns on the primary coil. primary coil secondary coil 600 input 240 V 40 V output turns How many turns are there on the secondary coil? A 100 B 320 C 400 D 3600

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2014

20 The diagram shows cables used in the transmission of electrical energy. High voltages are used for the transmission. transmission cables power station Why are high voltages used for the transmission of electrical energy? A Fear of high voltages stops people from interfering with the cables. B Heat loss in the cables is smaller than if low voltages are used. C High voltages increase the current in the cables. D High voltages produce large magnetic fields, so less insulation is needed.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2014

22 Which diagram shows the magnetic field pattern around a wire that is carrying a current perpendicular to the page? A B C D wire wire

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2014

23 The diagram shows a simple transformer with an input of 240 V and an output of 40 V. There are 600 turns on the primary coil. primary coil secondary coil 600 input 240 V 40 V output turns How many turns are there on the secondary coil? A 100 B 320 C 400 D 3600

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2014

34 The diagram shows a thin copper wire in a magnetic field. The current in the wire is from right to left. This causes an upward force on the wire. current force on wire The direction of the current and the direction of the magnetic field are both reversed. In which direction does the force act on the wire, after these changes are made? A downwards B into the page C out of the page D upwards

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2014

35 A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the circuit while the rod is moving. solenoid rod A Which rod is being inserted? A a heated copper rod B a magnetised steel rod C an uncharged nylon rod D a radioactive uranium rod

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2014

36 The diagram shows the structure of a transformer. core primary coil Which row shows a suitable material for the primary coil and a suitable material for the core? primary coil core A copper copper B copper iron C iron copper D iron iron

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2014

34 Which device uses slip rings? A a d.c. electric motor B a relay C a transformer D an a.c. generator

1 marks

Answer: D

This question in 0625/12 Feb/March 2015

35 The diagram shows a coil of wire connected to a voltmeter. coil of wire V A student has a magnet and an unmagnetised iron rod. How can an e.m.f. be induced across the coil? A holding the magnet inside the coil B holding the iron rod inside the coil C pushing the magnet into the coil D pushing the iron rod into the coil

1 marks

Answer: C

This question in 0625/12 Feb/March 2015

36 A step-down transformer is used to light a 12 V lamp from a 240 V mains supply. The lamp lights at normal brightness. The primary coil has 600 turns. primary coil secondary coil 600 turns 240 V 12 V lamp How many turns are in the secondary coil? A 12 B 20 C 30 D 50

1 marks

Answer: C

This question in 0625/12 Feb/March 2015

26 An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron core is just above some small soft-iron nails. electromagnet soft-iron core soft-iron nails The switch is now closed, left closed for a few seconds, and then opened. What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened? as switch is closed as switch is opened A nails jump up nails fall down B nails jump up nails stay up C nails stay down nails jump up D nails stay down nails stay down

1 marks

Answer: A

This question in 0625/11 May/June 2015

34 Which diagram shows the pattern of the magnetic field produced by a current-carrying solenoid? A B C D solenoid solenoid solenoid solenoid

1 marks

Answer: D

This question in 0625/11 May/June 2015

35 What is an advantage of transmitting electricity at a high voltage? A It is faster. B It is safer. C Less energy is wasted. D Less equipment is needed.

1 marks

Answer: C

This question in 0625/11 May/June 2015

36 A transformer has 1200 turns on its primary coil and 400 turns on its secondary coil. An output voltage of 90 V is induced across the secondary coil. primary coil secondary coil 1200 turns 400 turns output voltage 90 V What is the input voltage of the transformer? A 30 V B 90 V C 270 V D 1200 V

1 marks

Answer: C

This question in 0625/11 May/June 2015

26 An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron core is just above some small soft-iron nails. electromagnet soft-iron core soft-iron nails The switch is now closed, left closed for a few seconds, and then opened. What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened? as switch is closed as switch is opened A nails jump up nails fall down B nails jump up nails stay up C nails stay down nails jump up D nails stay down nails stay down

1 marks

Answer: A

This question in 0625/12 May/June 2015

34 An e.m.f. is induced across a wire when it moves through the magnetic field between the poles of a magnet. Which electrical device operates because of this effect? A a battery B a cathode-ray tube C a generator D a motor

1 marks

Answer: C

This question in 0625/12 May/June 2015

35 The diagram shows a flat, rectangular coil placed between the poles of a magnet. There is a current in the coil that makes it turn in the direction shown in the diagram. direction coil of turning N S current Which change would make the coil turn in the opposite direction? A decreasing the current in the coil B increasing the number of turns on the coil C reversing both the direction of the current in the coil and the poles of the magnet D reversing only the direction of the current in the coil

1 marks

Answer: D

This question in 0625/12 May/June 2015

36 A transformer has 1000 turns on its primary coil. An input voltage of 12 V is applied to the primary coil, and an output voltage of 120 V is induced across the secondary coil. primary coil 1000 turns secondary coil input voltage output voltage 12 V 120 V How many turns are on the secondary coil of the transformer? A 100 B 120 C 1000 D 10 000

1 marks

Answer: D

This question in 0625/12 May/June 2015

26 An electromagnet with a soft-iron core is connected to a battery and an open switch. The soft-iron core is just above some small soft-iron nails. electromagnet soft-iron core soft-iron nails The switch is now closed, left closed for a few seconds, and then opened. What do the soft-iron nails do as the switch is closed, and what do they do when the switch is then opened? as switch is closed as switch is opened A nails jump up nails fall down B nails jump up nails stay up C nails stay down nails jump up D nails stay down nails stay down

1 marks

Answer: A

This question in 0625/13 May/June 2015

34 A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments. N S N S S N magnet attracted to coil experiment 1 experiment 2 experiment 3 In experiment 1, the magnet is attracted to the coil. Which row shows what happens in the other two experiments? experiment 2 experiment 3 A magnet attracted magnet attracted B magnet attracted magnet repelled C magnet repelled magnet attracted D magnet repelled magnet repelled

1 marks

Answer: C

This question in 0625/13 May/June 2015

35 Which diagram represents the voltage output of a simple a.c. generator? A B voltage voltage 0 0 time time C D voltage voltage 0 0 time time

1 marks

Answer: B

This question in 0625/13 May/June 2015

36 A transformer has 400 turns on its secondary coil. An input voltage of 12 V is applied to the primary coil, and an output voltage of 120 V is induced across the secondary coil. primary coil secondary coil 400 turns input voltage output voltage 12 V 120 V How many turns are on the primary coil of the transformer? A 12 B 40 C 400 D 4000

1 marks

Answer: B

This question in 0625/13 May/June 2015

28 A student investigates the force on a bar magnet placed near a current-carrying coil. She carries out three different experiments. N S N S S N magnet attracted to coil experiment 1 experiment 2 experiment 3 In experiment 1, the magnet is attracted to the coil. Which row shows what happens in the other two experiments? experiment 2 experiment 3 A magnet attracted magnet attracted B magnet attracted magnet repelled C magnet repelled magnet attracted D magnet repelled magnet repelled

1 marks

Answer: C

This question in 0625/14 May/June 2015

33 Three cores of different metals, P, Q and R, are placed inside identical coils of wire. At least one of the metals is non-ferrous. The cores are held above some iron nails. The three diagrams below show what happens when there is a current in the coils. coil + + + – – – core P Q R iron nails The three diagrams below show what happens when the current is then switched off. + + + – – – P Q R Which row identifies whether the core metals are ferrous or non-ferrous? ferrous non-ferrous A P Q and R B P and Q R C Q and R P D R P and Q

1 marks

Answer: C

This question in 0625/14 May/June 2015

34 Which diagram represents the voltage output of a simple a.c. generator? A B voltage voltage 0 0 time time C D voltage voltage 0 0 time time

1 marks

Answer: B

This question in 0625/14 May/June 2015

36 The diagram shows a cathode-ray tube. cathode-rays cathode anode Which electrode should be heated, and which electrode should be positive? heated electrode positive electrode A anode anode B anode cathode C cathode anode D cathode cathode

1 marks

Answer: C

This question in 0625/14 May/June 2015

34 A step-up transformer is used before electricity is transmitted by overhead cables. Which statement explains why the step-up transformer is used? A It increases the current to increase the speed at which the electricity travels. B It increases the current to reduce energy loss in the cables. C It increases the voltage to increase the speed at which the electricity travels. D It increases the voltage to reduce energy loss in the cables.

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2015

35 A current-carrying wire XY lies in the magnetic field between the two poles of a U-shaped electromagnet. A force acts on the wire XY because of the magnetic field. Y electromagnet current-carrying wire X Each of the following actions is carried out separately. ● The current in the wire XY is reversed. ● The magnetic field is reversed. ● Both the current in the wire XY and the magnetic field are reversed at the same time. How many of these actions cause the direction of the force on the wire XY to be reversed? A 0 B 1 C 2 D 3

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2015

36 A current-carrying coil in a magnetic field experiences a turning effect. power supply + – N S coil How can the turning effect be increased? A Increase the number of turns on the coil. B Reduce the size of the current. C Reverse the direction of the magnetic field. D Use thinner wire for the coil.

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2015

35 A transformer has 2400 turns on its primary coil and 200 turns on its secondary coil. primary coil secondary coil 2400 turns 200 turns output voltage 240 V What input voltage is needed to give an output voltage of 240 V? A 12 V B 20 V C 240 V D 2880 V

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2015

36 A current-carrying coil in a magnetic field experiences a turning effect. power supply + – N S coil How can the turning effect be increased? A Increase the number of turns on the coil. B Reduce the size of the current. C Reverse the direction of the magnetic field. D Use thinner wire for the coil.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2015

25 Which metal could be used for a permanent magnet and which metal could be used for the core of an electromagnet? permanent core of magnet electromagnet A iron copper B iron steel C steel copper D steel iron

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2015

34 A student investigates electromagnetic induction. She has a bar magnet and a coil of wire that is connected to a sensitive ammeter. sensitive ammeter A N S coil of wire magnet Which movement does not cause a reading on the ammeter? A moving the coil to the right B moving both the magnet and the coil to the left at the same speed C moving both the magnet and the coil towards each other at the same speed D moving the magnet to the left

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2015

35 The primary coil of a transformer has 200 turns. This primary coil is connected to an a.c. power supply of 25 V. A voltmeter connected across the secondary coil reads 50 V. primary coil 200 turns secondary coil 25 V V 50 V a.c. How many turns are on the secondary coil? A 25 B 100 C 200 D 400

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2015

36 A current-carrying coil in a magnetic field experiences a turning effect. power supply + – N S coil How can the turning effect be increased? A Increase the number of turns on the coil. B Reduce the size of the current. C Reverse the direction of the magnetic field. D Use thinner wire for the coil.

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2015

35 A coil carries a current in a magnetic field. The coil experiences a turning effect. Which device uses this effect? A a d.c. motor B an electromagnet C a relay D a transformer

1 marks

Answer: A

This question in 0625/12 Feb/March 2016

36 A magnet is suspended from a spring so that it can move freely inside a stationary coil. The coil is connected to a sensitive centre-zero galvanometer. spring moving magnet N S centre-zero galvanometer stationary coil The magnet repeatedly moves slowly up and down. What does the galvanometer show? A a constantly changing reading B a steady reading to the left C a steady reading to the right D a steady reading of zero

1 marks

Answer: A

This question in 0625/12 Feb/March 2016

31 What is the function of a relay? A to allow a current in one circuit to operate a switch in another circuit B to prevent an electric shock by earthing a metal case C to protect a circuit by melting if the current becomes too large D to transform a d.c. voltage to a different value

1 marks

Answer: A

This question in 0625/11 May/June 2016

35 A strong electromagnet is used to attract pins. core current coil pins What happens when the current in the coil is halved? A No pins are attracted. B Some pins are attracted, but not as many. C The same number of pins is attracted. D More pins are attracted.

1 marks

Answer: B

This question in 0625/11 May/June 2016

36 The diagram shows a transformer. input output voltage voltage primary coil secondary coil 800 turns 40 turns The input voltage is 240 V. What is the output voltage? A 6.0 V B 12 V C 20 V D 40 V

1 marks

Answer: B

This question in 0625/11 May/June 2016

35 A strong electromagnet is used to attract pins. core current coil pins What happens when the current in the coil is halved? A No pins are attracted. B Some pins are attracted, but not as many. C The same number of pins is attracted. D More pins are attracted.

1 marks

Answer: B

This question in 0625/12 May/June 2016

36 The diagram shows a transformer. input output voltage voltage primary coil secondary coil 800 turns 40 turns The input voltage is 240 V. What is the output voltage? A 6.0 V B 12 V C 20 V D 40 V

1 marks

Answer: B

This question in 0625/12 May/June 2016

35 A strong electromagnet is used to attract pins. core current coil pins What happens when the current in the coil is halved? A No pins are attracted. B Some pins are attracted, but not as many. C The same number of pins is attracted. D More pins are attracted.

1 marks

Answer: B

This question in 0625/13 May/June 2016

36 The diagram shows a transformer. input output voltage voltage primary coil secondary coil 800 turns 40 turns The input voltage is 240 V. What is the output voltage? A 6.0 V B 12 V C 20 V D 40 V

1 marks

Answer: B

This question in 0625/13 May/June 2016

35 The diagram represents a transformer. core primary coil Which row shows materials suitable for making the core and the primary coil? core primary coil A iron copper B iron plastic C steel copper D steel plastic

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2016

36 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses and one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an a.c. supply C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an a.c. supply

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2016

35 A transformer has an input voltage of 240 V and an output voltage of 12 V. input voltage output voltage 240 V 12 V What is a possible pair of values for the number of turns in the primary coil and the number of turns in the secondary coil? number of turns number of turns in primary coil in secondary coil A 12 4800 B 240 4800 C 4800 12 D 4800 240

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2016

36 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses and one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an a.c. supply C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an a.c. supply

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2016

35 Which transformer can change a 240 V a.c. input into a 15 V a.c. output? A B 800 turns 40 turns 1000 turns 25 turns C D 2400 turns 15 turns 1200 turns 75 turns

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2016

36 An electric current can produce a heating effect and a magnetic effect. Which row shows the effect that a relay uses and one application of a relay? effect used by a relay one application of a relay A heating effect allowing a small current to switch on a large current B heating effect changing the voltage of an a.c. supply C magnetic effect allowing a small current to switch on a large current D magnetic effect changing the voltage of an a.c. supply

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2016

36 The diagram shows a simple transformer with an input of 240 V and an output of 40 V. There are 600 turns on the primary coil. primary coil secondary coil 600 input 240 V 40 V output turns How many turns are there on the secondary coil? A 100 B 320 C 400 D 3600

1 marks

Answer: A

This question in 0625/12 Feb/March 2017

37 A wire is placed between the poles of a horseshoe magnet. There is a current in the wire in the direction shown, and this causes a force to act on the wire. magnet current N wire S force Three other arrangements P, Q and R of the wire and magnet are set up as shown. P Q R S N S N S N magnet turned around current direction reversed current direction reversed and magnet turned around Which arrangements cause a force in the same direction as the original arrangement? A P, Q and R B P and Q only C P only D R only

1 marks

Answer: D

This question in 0625/12 Feb/March 2017

35 The diagram shows a transformer with primary coil P and secondary coil S. The input potential difference across coil P is VP. The output potential difference across coil S is VS. The number of turns in coil P is NP. The number of turns in coil S is NS. core input P S output Which equation relates the input and output voltages to the numbers of turns in P and in S? V = N A P P V N S S B VP × VS = NP × NS V = N C P S V N S P V = N D P P V ( N + N ) S P S

1 marks

Answer: A

This question in 0625/11 May/June 2017

36 What is the purpose of a relay? A to change a large voltage into a small voltage B to change a small voltage into a large voltage C to use a large current to switch on a small current D to use a small current to switch on a large current

1 marks

Answer: D

This question in 0625/11 May/June 2017

35 What is the purpose of a relay? A to change a large voltage into a small voltage B to change a small voltage into a large voltage C to use a large current to switch on a small current D to use a small current to switch on a large current

1 marks

Answer: D

This question in 0625/12 May/June 2017

36 A coil of four loops of wire is placed in a magnetic field. When there is a current, the coil experiences a turning effect. Some extra loops of wire are wound on the coil but the current is unchanged. How does this affect the turning effect? A It is unchanged. B Its direction changes. C It decreases. D It increases.

1 marks

Answer: D

This question in 0625/12 May/June 2017

26 From which materials are the coil and the core of an electromagnet made? coil core A copper soft iron B copper steel C soft iron copper D steel soft iron

1 marks

Answer: A

This question in 0625/13 May/June 2017

27 In which way are a bar magnet and an electromagnet similar? A A bar magnet and an electromagnet are always magnetised when stored. B A bar magnet and an electromagnet can both be used to separate magnetic and non-magnetic materials. C A bar magnet can be made of steel and an electromagnet uses a steel core. D The magnetic field strength of a bar magnet and of an electromagnet can both be varied.

1 marks

Answer: B

This question in 0625/13 May/June 2017

35 A wire moves in the direction shown between the poles of a magnet. wire N S movement of wire Which change increases the magnitude of the induced electromotive force (e.m.f.) across the ends of the wire? A increasing the gap between the poles of the magnet B moving the wire faster C using a shorter wire D using a thinner wire

1 marks

Answer: B

This question in 0625/13 May/June 2017

36 What is the purpose of a relay? A to change a large voltage into a small voltage B to change a small voltage into a large voltage C to use a large current to switch on a small current D to use a small current to switch on a large current

1 marks

Answer: D

This question in 0625/13 May/June 2017

36 There is an electric current in a straight wire in the direction into the page. This produces a magnetic field around the wire. All the field lines are circles but only one field line is shown. magnetic field line wire with current into the page Which row describes the magnetic field? direction of spacing of the field lines the field lines A anti-clockwise evenly spaced over the whole field B anti-clockwise more widely spaced further from the wire C clockwise evenly spaced over the whole field D clockwise more widely spaced further from the wire

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2017

37 A wire carrying a current is placed in a magnetic field. The wire experiences a force due to the field. Which action does not change the direction of the force? A increasing the current and reversing the field direction B increasing the current, keeping the field direction constant C reversing the current and increasing the field strength D reversing the current, keeping the field direction constant

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2017

29 Two circuits are set up as shown. The iron rods are placed close together and are able to move. S iron rod iron rod X What happens to the size of the gap at X when switch S is closed? A It decreases. B It decreases then increases. C It increases. D It does not change.

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2017

36 The diagram shows a bar magnet and a coil of wire. The bar magnet is moved at the same speed in each experiment. In which situation is the largest electromotive force (e.m.f.) induced? A B moves right stationary moves left stationary bar magnet coil bar magnet coil C D moves left at same moves left at same moves right speed as bar magnet moves left speed as bar magnet bar magnet coil bar magnet coil

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2017

37 Diagram 1 shows a wire carrying an electric current. The wire is between the poles of a magnet. The current and the magnetic field produce a force on the wire which is upwards, as shown. force current N S S N current diagram 1 diagram 2 The magnetic poles and the current are now both reversed, as in diagram 2. In which direction is the force on the wire in diagram 2? A downwards B towards the North pole of the magnet C towards the South pole of the magnet D upwards

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2017

35 An electrical device requires a voltage of 5.0 V to operate normally. The mains supply voltage is 250 V. Which row shows a transformer that provides output voltage that enables the device to operate normally when connected to the mains supply? number of turns on number of turns on the primary coil the secondary coil A 500 2500 B 500 25 000 C 2500 500 D 25 000 500

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2017

36 A straight current-carrying wire has a magnetic field around it. Which diagram best shows the magnetic field pattern around the wire? A B C D

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2017

35 Which statement about electromagnetic induction is correct? A A strong magnet that is held stationary near a stationary conductor causes a greater effect than a weak magnet. B The effect occurs when a magnet and a conductor are both moved with the same speed and in the same direction. C The effect occurs when a magnet is moved away from a nearby conductor. D The effect only occurs when a magnet is moved towards a conductor.

1 marks

Answer: C

This question in 0625/11 May/June 2018

36 An electrical device changes the voltage of an electrical supply from 240 V a.c. to 20 V a.c. What is this device? A a generator B a relay C a transformer D a voltmeter

1 marks

Answer: C

This question in 0625/11 May/June 2018

34 A simple electric generator induces an electromotive force (e.m.f.). Which modification would increase the induced e.m.f.? A Increase the number of turns in the coil of the generator. B Increase the distance between the magnetic poles. C Reduce the strength of the magnetic field around the coil. D Reverse the direction of the magnetic field.

1 marks

Answer: A

This question in 0625/12 May/June 2018

35 A transformer has Np turns in the primary coil and Ns turns in the secondary coil. Which row gives the values of Np and Ns for a transformer that steps up a voltage of 1200 V to 36 000 V? Np Ns A 2 000 60 000 B 2 000 600 000 C 60 000 2 000 D 600 000 2 000

1 marks

Answer: A

This question in 0625/12 May/June 2018

36 A straight wire is perpendicular to the paper. It carries a current into the paper. What is the magnetic field pattern and its direction near the wire? A B C D key wire with current into the page

1 marks

Answer: C

This question in 0625/12 May/June 2018

34 The diagram shows a transformer. core primary coil secondary coil Which materials are the most suitable for the core and for the coils? core material coil material A copper copper B copper iron C iron copper D iron iron

1 marks

Answer: C

This question in 0625/13 May/June 2018

35 A current-carrying conductor placed in a magnetic field experiences a force. Which changes result in reversing the direction of the force? A Decrease the current, keeping the field direction constant. B Increase the current and reverse the field direction. C Increase the current, keeping the field direction constant. D Reverse the current and reverse the field direction.

1 marks

Answer: B

This question in 0625/13 May/June 2018

36 A solenoid is connected to a battery. axis of solenoid solenoid Which statement about the magnetic field at the centre of the solenoid is correct? A The magnetic field along the axis is zero. B The direction of the magnetic field is at an angle of 45° to the axis. C The direction of the magnetic field is parallel to the axis. D The direction of the magnetic field is perpendicular to the axis.

1 marks

Answer: C

This question in 0625/13 May/June 2018

35 Which electrical device uses the turning effect produced by a current-carrying coil in a magnetic field? A a.c. generator B d.c. motor C relay D transformer

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2018

36 A wire is placed in a strong magnetic field. When a current is passed through the wire it moves upwards, as shown. S N movement The current is reversed. In which direction does the wire move? A downwards B towards the north pole C towards the south pole D upwards

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2018

35 The diagram shows a horizontal wire between the two magnetic poles of a U-shaped magnet. The U-shaped magnet is on a balance. When the switch closed, the reading on the balance decreases. switch switch open closed magnetic magnetic poles poles 125.20 g 123.49 g The experiment is carried out three more times with the following changes made. 1 Only the current is reversed. 2 Only the magnetic field is reversed. 3 Both the current and the magnetic field are reversed at the same time. Which changes cause an increase in the reading on the balance? A 1 only B 2 only C 3 only D 1 and 2 only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2018

36 The diagram shows a coil of wire between the poles of a magnet. 20 turns N S + – power supply The coil consists of 20 turns of insulated wire. The coil is connected to a variable resistor and a power supply. How can the turning effect on the coil be increased? A by moving the poles of the magnet closer to the coil B by reducing the number of turns on the coil while keeping the current constant C by increasing the resistance of the variable resistor D by reversing the terminals of the power supply

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2018

35 There is an electric current in a wire. The wire is placed in a magnetic field. A force acts on the wire due to the current. Which statement is correct? A The magnetic field must be produced by a permanent magnet and not by an electromagnet. B The wire must be made from a magnetic material. C When both the current and the magnetic field are reversed, the direction of the force is unchanged. D When the current is reversed, but not the magnetic field, there will be no force on the wire.

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2018

36 Which diagram shows the pattern and direction of the magnetic field due to a current in a straight wire? A B current current C D current current

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2018

26 Which action will not magnetise a rod? A placing a copper rod inside a coil carrying a direct current B stroking a steel rod with a permanent magnet C hammering a steel rod aligned with the Earth’s magnetic field D placing a soft-iron rod close to a permanent magnet

1 marks

Answer: A

This question in 0625/12 Feb/March 2019

34 A student wishes to demonstrate electromagnetic induction. He has a magnet and connecting wires. Which other apparatus does he need? voltmeter battery v v key Jv = needed X = not needed 0 OD > «x « & «x < x

1 marks

Answer: B

This question in 0625/12 Feb/March 2019

35 The diagram shows a transformer connected to a 240 V a.c. supply. soft-iron core primary coil secondary coil 60 turns 30 turns 240 V a.c. What is the potential difference across the secondary coil of the transformer? A 30 V B 120 V C 240 V D 480 V

1 marks

Answer: B

This question in 0625/12 Feb/March 2019

36 A current-carrying coil is placed in a magnetic field. view from above coil magnetic field lines Which effect does the coil experience? A a change in shape B a change in weight C a resultant force D a turning effect

1 marks

Answer: D

This question in 0625/12 Feb/March 2019

28 Why is soft iron used for the core of an electromagnet? A Soft iron easily becomes a permanent magnet. B Soft iron is a good electrical conductor. C Soft iron is a poor thermal conductor. D Soft iron loses its magnetism when the current in the coil is switched off.

1 marks

Answer: D

This question in 0625/11 May/June 2019

36 A bar magnet is held near a coil of wire. The coil is connected to a sensitive voltmeter. coil of wire bar magnet N V The N-pole of the magnet is moved quickly towards the coil. The voltmeter shows a reading of +10 mV. The N-pole of the magnet is then moved slowly away from the same end of the coil. The reading on the voltmeter is observed. Which voltmeter reading is possible? A –15 mV B –5 mV C 0 mV D +5 mV

1 marks

Answer: B

This question in 0625/11 May/June 2019

37 Four small compasses are placed around a solenoid. solenoid A current is now switched on in the solenoid. Which diagram shows possible new directions of the compass needles? A B C D

1 marks

Answer: D

This question in 0625/11 May/June 2019

33 The circuit shows a relay being used to operate a mains lamp. Two ammeters are labelled P and Q. P Q A A mains lamp The variable resistor is used to vary the current in the relay coil. The mains lamp switches on when there is a large enough current in the relay coil. The graph shows how the reading on ammeter Q changes as the reading on ammeter P increases. 0.20 reading on 0.15 ammeter Q / A 0.10 0.05 0.00 0.00 0.10 0.20 0.30 0.40 0.50 0.60 reading on ammeter P / A What is the minimum current needed in the relay coil to switch on the mains lamp? A 0.15 A B 0.20 A C 0.35 A D 0.60 A

1 marks

Answer: B

This question in 0625/12 May/June 2019

36 A bar magnet is held near a solenoid. The coil is connected to a galvanometer. solenoid bar magnet The magnet is moved into the coil of wire and then held stationary inside the coil. Which graph shows how the induced electromotive force (e.m.f.) varies with time? A B C D e.m.f. e.m.f. e.m.f. e.m.f. 0 0 0 0 0 time 0 time 0 time 0 time

1 marks

Answer: C

This question in 0625/12 May/June 2019

37 A wire XY lies between the poles of a magnet. The diagram shows the upward force on the wire XY caused when there is an electric current in the direction XY as shown. X current force N S Y Three tests are made using this apparatus. 1 The current direction is reversed. 2 The N and S poles are swapped around. 3 The current is switched off. Which will result in no change in the size of the force on the wire? A 1 and 2 only B 1 only C 2 only D 3 only

1 marks

Answer: A

This question in 0625/12 May/June 2019

28 A metal bar is placed inside a current-carrying coil, as shown in diagram 1. There is a small current in the coil. The bar holds a few nails, as shown in diagram 2. nails diagram 1 diagram 2 When there is no current in the coil, the nails drop off. Which row is correct? metal from which effect of a larger the bar is made current in the coil A soft iron it makes no difference B soft iron the bar holds more nails C steel it makes no difference D steel the bar holds more nails

1 marks

Answer: B

This question in 0625/13 May/June 2019

36 In an experiment, a wire is held above a compass needle as shown. N S An electric current is switched on in the wire and the compass needle is deflected. Which row explains why this happens and then describes what happens when the current is reversed? what happens when why this happens the current is reversed A there is a magnetic the compass needle deflects field inside the wire in the opposite direction B there is a magnetic there is no effect on field inside the wire the compass needle C there is a magnetic the compass needle deflects field around the wire in the opposite direction D there is a magnetic there is no effect on field around the wire the compass needle

1 marks

Answer: C

This question in 0625/13 May/June 2019

37 Which device relies upon the magnetic effect of an electric current? A fuse B relay C thermistor D variable resistor

1 marks

Answer: B

This question in 0625/13 May/June 2019

28 Two soft-iron rods are placed end-to-end inside a coil. The coil is connected to a battery. coil soft-iron rod soft-iron rod The connections from the battery to the coil are now reversed. What happens to the soft-iron rods in each case? battery connections battery connections as shown reversed A rods attract rods attract B rods attract rods repel C rods repel rods attract D rods repel rods repel

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2019

35 A student investigates the output voltage induced across a coil of wire by a bar magnet. When will the induced voltage have the greatest value? A The student slowly moves the bar magnet into the coil of wire. B The student leaves the bar magnet stationary in the coil of wire. C The student quickly removes the bar magnet from the coil of wire. D The student places the bar magnet at rest outside the coil of wire.

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2019

36 There is a current in a wire. The direction of the current is out of the page. Which diagram shows the magnetic field pattern produced? A B key wire carrying a current out of the page C D

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2019

28 Two soft-iron rods are placed end-to-end inside a coil. The coil is connected to a battery. coil soft-iron rod soft-iron rod The connections from the battery to the coil are now reversed. What happens to the soft-iron rods in each case? battery connections battery connections as shown reversed A rods attract rods attract B rods attract rods repel C rods repel rods attract D rods repel rods repel

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2019

35 The N-pole of a magnet is moved into a coil of wire connected to a galvanometer. coil S N The needle of the galvanometer moves. Which situation must give a smaller galvanometer reading? A Use a coil with fewer turns and a stronger magnet. B Use a coil with fewer turns and a weaker magnet. C Use a coil with more turns and a stronger magnet. D Use a coil with more turns and a weaker magnet.

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2019

36 The diagram shows a conductor carrying current in a direction out of the plane of the page. Which set of arrows represents the direction of the magnetic field due to this current? A B key wire carrying a current out of the paper C D

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2019

28 Two soft-iron rods are placed end-to-end inside a coil. The coil is connected to a battery. coil soft-iron rod soft-iron rod The connections from the battery to the coil are now reversed. What happens to the soft-iron rods in each case? battery connections battery connections as shown reversed A rods attract rods attract B rods attract rods repel C rods repel rods attract D rods repel rods repel

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2019

35 A step-up transformer produces a 60 V a.c. output from a 12 V a.c. input. There are 50 turns on the secondary coil. How many turns are there on the primary coil? A 5 B 10 C 50 D 250

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2019

36 A student uses a balance, a magnet and a power supply to determine the force on a wire in a magnetic field. The wire is held between the poles of the magnet. The student switches on the power supply. The diagrams show the readings with and without a current in the wire. power supply power supply off on wire wire N N S S magnet 108 g 107 g balance no current in wire current in wire The student reverses the current in the wire. The magnitude of the current does not change. What is the new reading on the balance? A 106 g B 107 g C 108 g D 109 g

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2019

35 A transformer has 200 turns on its primary coil and is connected to a 240 V a.c. supply. The output voltage of the transformer is 60 V a.c.. How many turns are on the secondary coil of the transformer? A 20 B 50 C 72 D 800

1 marks

Answer: B

This question in 0625/11 May/June 2020

36 A conducting wire is placed between the poles of a magnet. When an electric current in the wire is in the direction shown, then the force on the wire acts out of the page. wire N S Three statements of different conditions and how the wire is affected are given. 1 The current is towards the top of the page and the direction of the magnetic field is unchanged then the force produced acts into the page. 2 The current is towards the bottom of the page and the magnetic field is reversed then the force produced acts into the page. 3 The current in the wire is alternating and the wire vibrates into and out of the page. Which statements are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0625/11 May/June 2020

35 The diagrams P, Q and R show three voltage–time graphs. diagram P diagram Q + + voltage voltage 0 0 0 time 0 time – – diagram R + voltage 0 0 time – Which graphs show an alternating voltage? A P and Q only B P and R only C Q and R only D P, Q and R

1 marks

Answer: D

This question in 0625/12 May/June 2020

36 The diagram shows a transformer. core primary coil secondary coil 40 turns 40 000 turns Which statement about this transformer is correct? A It can operate from a 12 V battery. B It has a core which is made of steel. C It steps the input voltage up by a factor of 1000. D It steps the input voltage down by a factor of 1000.

1 marks

Answer: C

This question in 0625/12 May/June 2020

36 The diagram represents the transmission of electricity from a power station to homes that are many kilometres away. Two transformers are labelled X and Y. transmission pylon cables pylon cables large houses power ground station X distance Y What type of transformers are X and Y? X Y A step-down transformer step-down transformer B step-down transformer step-up transformer C step-up transformer step-down transformer D step-up transformer step-up transformer

1 marks

Answer: C

This question in 0625/13 May/June 2020

34 An electromagnet is positioned close to a coil of wire. electromagnet coil The electromagnet is switched on, remains on for a short time, and is then switched off. Three statements about the pointer on the galvanometer during this sequence are given. 1 The pointer kicks to one side as the electromagnet is switched on. 2 The pointer records a steady non-zero value while the electromagnet remains switched on. 3 The pointer kicks to the other side as the electromagnet is switched off. Which statements are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2020

35 A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1 000 B 240 48 000 C 480 24 D 2000 100

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2020

36 The diagrams show a current-carrying wire with an arrow in the direction of the current. Which diagram shows the magnetic field produced by the current? A B magnetic magnetic field lines field lines wire wire C D magnetic magnetic field lines field lines wire wire

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2020

34 A student investigates electromagnetic induction. She moves the N pole of a magnet quickly towards a coil of wire. There is a reading on the galvanometer. coil of wire bar magnet S N What can she do to get a greater reading on the galvanometer? A Hold the bar magnet stationary inside the coil. B Move the bar magnet slowly away from the coil. C Use a coil of wire with fewer turns on it. D Use a stronger bar magnet.

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2020

35 A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1 000 B 240 48 000 C 480 24 D 2000 100

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2020

36 The diagram shows a wire carrying a current in the direction shown. The wire is between the poles of a magnet. A force is produced on the wire out of the page. wire N S direction of current The wire and magnet are now put into different arrangements X, Y and Z. The arrow shows the direction of the current in each case. X Y Z N S S N S N In which arrangements is the force on the wire out of the page? A X only B X and Y C X and Z D Z only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2020

32 Three statements about a relay are given. 1 A relay has a coil that becomes a temporary magnet when in operation. 2 A large current in a relay coil is used to switch off a smaller current. 3 A small current in a relay coil is used to switch on a larger current. Which statements are correct? A 1 and 2 only B 2 and 3 only C 1 and 3 only D 1, 2 and 3

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2020

34 When a metal wire moves up, cutting a magnetic field, an electromotive force (e.m.f.) is induced across the wire. Which change affects the magnitude of the induced e.m.f.? A moving the wire down at the same speed B moving the wire up at a faster speed C using a thicker wire D using a wire made from a different metal

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2020

35 A transformer is needed to convert a supply of 240 V a.c. into 4800 V a.c.. NP NS 240 V a.c. 4800 V a.c. Which pair of coils would be suitable for this transformer? number of turns number of turns on primary coil NP on secondary coil NS A 50 1 000 B 240 48 000 C 480 24 D 2000 100

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2020

36 The diagram shows a wire carrying a current in the direction shown. There is a magnetic field acting from left to right. The wire experiences a force acting out of the page. direction of current wire direction of magnetic field The current is now reversed. In which direction does the force on the wire now act? A into the page B out of the page C to the left D to the right

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2020

30 Three cores of different metals P, Q and R are placed inside identical coils of wire. At least one of the metals is non-magnetic. The cores are held above some iron nails. The three diagrams show what happens when there is a current in the coils. coil + + + – – – core P Q R iron nails The three diagrams below show what happens when the current is then switched off. + + + – – – P Q R Which core metals are magnetic? A P only B R only C P and Q D Q and R

1 marks

Answer: D

This question in 0625/12 Feb/March 2021

35 The diagram shows an electromagnet near a coil of wire connected to a voltmeter. The reading on the voltmeter is zero. electromagnet coil soft iron switch V + – The switch is closed. The electromagnet magnetises quickly. What happens to the reading on the voltmeter? A It keeps increasing. B It quickly increases and stays at maximum. C It quickly increases and then decreases. D It stays on zero.

1 marks

Answer: C

This question in 0625/12 Feb/March 2021

36 Which diagram represents the voltage output of a simple a.c. generator? A B voltage voltage 0 0 0 time 0 time C D voltage voltage 0 0 0 time 0 time

1 marks

Answer: B

This question in 0625/12 Feb/March 2021

28 Three piles of small nails, P, Q and R, are placed on a bench below three electromagnets. One set of nails is made of copper, one of soft iron and one of steel. Diagram 1 shows the situation when the electromagnets are switched on. Diagram 2 shows the situation when the electromagnets are then switched off. diagram 1 the switches are closed Q R P bench small nails diagram 2 the switches are open small nails R bench P Q Which row correctly identifies the materials from which the nails are made? copper soft iron steel A P Q R B P R Q C Q P R D Q R P

1 marks

Answer: A

This question in 0625/12 May/June 2021

34 A solenoid is connected to a very sensitive ammeter. A rod is inserted into one end of the solenoid. The ammeter shows that there is a small electric current in the solenoid while the rod is moving. solenoid rod A Which rod is being inserted? A a heated copper rod B a magnetised steel rod C an uncharged nylon rod D a radioactive uranium rod

1 marks

Answer: B

This question in 0625/12 May/June 2021

35 The diagram shows a transformer. iron core 550 turns 115 turns output 22 000 V voltage What is the output voltage? A 0.35 V B 2.9 V C 4600 V D 105 000 V

1 marks

Answer: C

This question in 0625/12 May/June 2021

36 The diagram shows a d.c. motor. coil magnet N S split-ring commutator carbon brush battery Which two changes together will always make the coil spin more slowly? A Decrease the current in the coil and use a magnet of less strength. B Decrease the current in the coil and increase the number of turns on the coil. C Increase the current in the coil and use a magnet of less strength. D Increase the current in the coil and decrease the number of turns on the coil.

1 marks

Answer: A

This question in 0625/12 May/June 2021

29 The step-down transformer shown reduces mains voltage to 12 V. copper wire soft-iron core mains 12 V voltage When the transformer is used, some energy is transferred to the surroundings. Which type of energy is transferred to the surroundings? A chemical energy B light energy C thermal energy D elastic energy

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2021

35 Which graph represents an alternating current (a.c.)? A B current current 0 0 0 time 0 time C D current current 0 0 0 time 0 time

1 marks

Answer: A

This question in 0625/11 Oct/Nov 2021

8 Electrical energy may be obtained from nuclear fission. In which order is the energy transferred in this process? A nuclear fuel  generator  reactor and boiler  turbines B nuclear fuel  generator  turbines  reactor and boiler C nuclear fuel  reactor and boiler  generator  turbines D nuclear fuel  reactor and boiler  turbines  generator

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2021

35 Four positions of a current-carrying coil in a magnetic field, as in a d.c. motor, are shown. In diagrams 2 and 4, the coil is at an angle of 45 to the field lines. 1 2 3 4 N S N S N S N S coil Which row is correct? turning effect of the forces turning effect of the forces in positions 1 and 3 in positions 2 and 4 A different different B different same C same different D same same

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2021

35 Which diagram shows the magnetic field around a straight, current-carrying wire? A B current current C D current current

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2021

35 Two magnets are placed near a current-carrying coil. The diagram shows this experimental arrangement and the current direction in the coil. X Y N S N S Which statement is correct? A Both X and Y are attracted to the coil. B Both X and Y are repelled by the coil. C X is attracted to the coil and Y is repelled. D X is repelled by the coil and Y is attracted.

1 marks

Answer: B

This question in 0625/12 Feb/March 2022

36 Which arrangement can be used to step up a voltage? A B iron core iron core a.c. d.c. output output input input C D iron core iron core a.c. d.c. output output input input

1 marks

Answer: A

This question in 0625/12 Feb/March 2022

27 A student counts how many iron pins an electromagnet picks up when its power supply is switched on. Then, she counts how many pins are picked up when the power supply is switched off. core d.c. power d.c. power supply on supply off iron pins She repeats the experiment using cores made of different materials. The results are shown. Which core is made out of soft iron? pins picked up with pins picked up with the power supply on the power supply off A 0 0 B 2 7 C 8 5 D 12 0

1 marks

Answer: D

This question in 0625/11 May/June 2022

35 Which transformer can change a 240 V a.c. input into a 15 V a.c. output? A B 800 turns 40 turns 1000 turns 25 turns C D 2400 turns 15 turns 1200 turns 75 turns

1 marks

Answer: D

This question in 0625/11 May/June 2022

36 The diagrams show patterns around a straight wire carrying a current perpendicularly out of the page. Which pattern represents the magnetic field due to the current in the wire? A B C D

1 marks

Answer: B

This question in 0625/11 May/June 2022

37 A current-carrying coil in a magnetic field experiences a turning effect. Three suggestions for increasing the turning effect are given. 1 Increase the number of turns on the coil. 2 Increase the current in the coil. 3 Increase the strength of the magnetic field. Which suggestions are correct? A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0625/11 May/June 2022

35 Electrical power is transmitted from power stations to homes using the National Grid. In which part of the National Grid is the voltage highest? B A C D step-up step-down step-down transformer transformer transformer power houses station

1 marks

Answer: B

This question in 0625/12 May/June 2022

36 Which transformer can change a 240 V a.c. input into a 15 V a.c. output? A B 800 turns 40 turns 1000 turns 25 turns C D 2400 turns 15 turns 1200 turns 75 turns

1 marks

Answer: D

This question in 0625/12 May/June 2022

37 The coils in two electric motors are identical in size, but motor 1 is observed to spin more quickly than motor 2. Three suggestions are made to explain this observation. 1 The current in the coil of motor 1 is greater than the current in the coil of motor 2. 2 The number of turns on the coil of motor 1 is greater than on the coil of motor 2. 3 The magnets in motor 1 are stronger than the magnets in motor 2. Which suggestions give a possible explanation for this observation? A 1 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

1 marks

Answer: D

This question in 0625/12 May/June 2022

36 Which transformer can change a 240 V a.c. input into a 15 V a.c. output? A B 800 turns 40 turns 1000 turns 25 turns C D 2400 turns 15 turns 1200 turns 75 turns

1 marks

Answer: D

This question in 0625/13 May/June 2022

37 The diagram shows a wire hanging from a metal loop P and dipping into a bath of mercury. P N S mercury The wire is hanging vertically between the N and S poles of a magnet. The loop P is then connected to the positive terminal of a battery and the mercury is connected to the negative terminal. The wire swings out of the page. In which direction does the wire move when P is connected to the negative terminal of the battery and the mercury is connected to the positive terminal? A The wire swings into the page. B The wire swings out of the page. C The wire swings to the left. D The wire swings to the right.

1 marks

Answer: A

This question in 0625/13 May/June 2022

34 Four small compasses are placed around a solenoid. solenoid A current is now switched on in the solenoid. Which diagram shows possible new directions of the compass needles? A B C D

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2022

35 Transformers are used in the transmission of electrical power to houses. Which type of transformer is used at the power station prior to connection to the power lines and which type is used prior to delivery to the houses? power station before houses A step-down step-down B step-down step-up C step-up step-down D step-up step-up

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2022

36 The diagrams show the coils of two simple direct current (d.c.) motors. Coil P has three turns of wire and coil Q has two turns. Coil P has the same dimensions as coil Q. The coils are in identical magnet fields. coil P coil Q What produces the greatest turning effect? coil current / A A P 2 B P 4 C Q 2 D Q 4

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2022

34 Four small compasses are placed around a solenoid. solenoid A current is now switched on in the solenoid. Which diagram shows possible new directions of the compass needles? A B C D

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2022

35 Which metal is used for the core of a transformer? A aluminium B copper C soft iron D steel

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2022

36 The diagram shows the design of a type of relay. pivot spring N P terminals for external circuit Two parts are labelled N and P. From which metal is N made and from which metal is P made? N P A soft iron soft iron B soft iron steel C steel soft iron D steel steel

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2022

31 A wire is moved down in a direction perpendicular to the magnetic field. N S Three changes are suggested. 1 The speed of the movement of the wire is increased. 2 The magnetic field strength is decreased. 3 The direction of the magnetic field is reversed. Which changes increase the electromotive force (e.m.f.) induced in the wire? A 1 and 3 B 1 only C 2 and 3 D 3 only

1 marks

Answer: B

This question in 0625/12 Feb/March 2023

32 In an experiment, a wire is held above a compass needle as shown. N S An electric current is switched on in the wire and the compass needle is deflected. Which row explains why this happens and then describes what happens when the current is reversed? what happens when why this happens the current is reversed A there is a magnetic the compass needle deflects field inside the wire in the opposite direction B there is a magnetic the compass needle remains field inside the wire deflected in the same direction C there is a magnetic the compass needle deflects field around the wire in the opposite direction D there is a magnetic the compass needle remains field around the wire deflected in the same direction

1 marks

Answer: C

This question in 0625/12 Feb/March 2023

33 Over time, the strength of the magnets in an electric motor decreases. Which row describes two ways to keep the motor running at its original speed? current in number of turns the coil on the coil A decrease decrease B decrease increase C increase decrease D increase increase

1 marks

Answer: D

This question in 0625/12 Feb/March 2023

31 A simple electric generator induces an electromotive force (e.m.f.). Which modification would increase the induced e.m.f.? A Increase the number of turns in the coil of the generator. B Increase the distance between the magnetic poles. C Reduce the strength of the magnetic field around the coil. D Reverse the direction of the magnetic field.

1 marks

Answer: A

This question in 0625/11 May/June 2023

32 The diagram shows a vertical wire carrying a current I placed between the poles of a magnet. I N S What is the direction of the force on the wire exerted by the magnetic field? A from N to S B from S to N C horizontal and at right angles to the direction from N to S D parallel to the wire

1 marks

Answer: C

This question in 0625/11 May/June 2023

33 What is an advantage of transmitting electricity at a high voltage? A It is faster. B It is safer. C Less energy is wasted. D Less equipment is needed.

1 marks

Answer: C

This question in 0625/11 May/June 2023

31 A student investigates the output voltage induced across a coil of wire by a bar magnet. When will the induced voltage have the greatest value? A The student slowly moves the bar magnet into the coil of wire. B The student leaves the bar magnet stationary in the coil of wire. C The student quickly removes the bar magnet from the coil of wire. D The student places the bar magnet at rest outside the coil of wire.

1 marks

Answer: C

This question in 0625/12 May/June 2023

32 In which device is the magnetic effect of a current not used? A electromagnet B loudspeaker C potential divider D relay

1 marks

Answer: C

This question in 0625/12 May/June 2023

33 The diagram represents the transmission of electricity from a power station to homes that are many kilometres away. Two transformers are labelled X and Y. transmission pylon cables pylon cables large houses power ground station X distance Y What type of transformers are X and Y? X Y A step-down transformer step-down transformer B step-down transformer step-up transformer C step-up transformer step-down transformer D step-up transformer step-up transformer

1 marks

Answer: C

This question in 0625/12 May/June 2023

23 Which row gives the metal used to make the core of an electromagnet and one property of the electromagnet? metal property A iron permanent magnet B iron temporary magnet C steel permanent magnet D steel temporary magnet

1 marks

Answer: B

This question in 0625/13 May/June 2023

30 Which electrical device uses the turning effect produced by a current-carrying coil in a magnetic field? A a.c. generator B d.c. motor C relay D transformer

1 marks

Answer: B

This question in 0625/13 May/June 2023

31 Four appliances all use an electric current to operate. Which appliance uses the magnetic effect of the current? A a heater B a light bulb C a relay D a remote controller

1 marks

Answer: C

This question in 0625/13 May/June 2023

32 A student makes four different types of transformer. She counts the number of turns on the primary and secondary coils. She labels each transformer as either step-up or step-down. Which row shows the correct labels? number of number of step-up or turns on the turns on the step-down primary coil secondary coil transformer A 5 5 step-up B 10 5 step-up C 10 20 step-down D 20 10 step-down

1 marks

Answer: D

This question in 0625/13 May/June 2023

33 How is electricity transmitted over large distances and why is it transmitted in this way? how why A at high voltage for safety B at high voltage to reduce energy loss C at low voltage for safety D at low voltage to reduce energy loss

1 marks

Answer: B

This question in 0625/13 May/June 2023

24 Which metal could be used for a permanent magnet and which metal could be used for the core of an electromagnet? permanent core of magnet electromagnet A iron copper B iron steel C steel copper D steel iron

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2023

31 A teacher sets up the equipment for three demonstrations, P, Q and R. P Q magnet coil soft-iron rod coil 1 coil 2 S N V V R copper rod S N V In demonstration P, the magnet is moved to the right. In demonstration Q, the switch is closed. In demonstration R, the copper rod is moved vertically upwards. Which demonstrations can be used to demonstrate electromagnetic induction? A P and Q only B P and R only C Q and R only D P, Q and R

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2023

32 A metal rod PQ rests on two horizontal metal wires that are attached to a battery. The rod lies between the poles of a magnet. magnet N Q metal rod P S magnet When the switch is closed, the rod moves to the right. What could be changed so that the rod moves to the left? A Open the switch. B Reverse the battery terminals and exchange the poles of the magnet. C Reverse the battery terminals but without exchanging the poles of the magnet. D Turn the metal rod around (P and Q exchanged).

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2023

33 A transformer in a computer is used to transform the mains voltage of 240 V to 12 V. The number of turns on the secondary coil is 2000. Which statement about the transformer is correct? A It is a step-down transformer and has 100 turns on its primary coil. B It is a step-down transformer and has 40 000 turns on its primary coil. C It is a step-up transformer and has 100 turns on its primary coil. D It is a step-up transformer and has 40 000 turns on its primary coil.

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2023

32 The diagram shows a wire in the magnetic field between two poles of a magnet. magnet N S wire The current in the wire repeatedly changes between a constant value in one direction and a constant value in the opposite direction, as shown in the graph. current 0 0 time What is the effect on the wire? A The force on the wire alternates between one direction and the opposite direction. B The force on the wire is constant in size and direction. C There is no force acting on the wire at any time. D There is only a force on the wire when the current reverses.

1 marks

Answer: A

This question in 0625/12 Oct/Nov 2023

33 A transformer has Np turns on its primary coil and Ns turns on its secondary coil. The voltage across the primary coil is Vp and the voltage across the secondary coil is Vs. What is the relationship between these four quantities? A Vp  Vs = Np  Ns V N B p = p V N s s V N C p = s V N s p V D p = Np  Ns V s

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2023

31 A generator uses the principle of electromagnetic induction. axis of rotation coil of copper wire magnet N S V Which change would increase the induced electromotive force (e.m.f.) in the coil? A increasing the number of turns in the coil B placing the magnets further apart C using a coil made from steel wire D reversing one of the magnets

1 marks

Answer: A

This question in 0625/13 Oct/Nov 2023

32 A current passes along a wire placed between the poles of a permanent magnet. The wire experiences a force due to the magnetic field. N S What will change the direction of this force? A increasing the current B reversing the current C increasing the strength of the magnetic field D using an electromagnet with the same polarity as the permanent magnet

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2023

33 What is a transformer used for? A changing a direct current into an alternating current B changing the magnitude of an alternating voltage C reducing the frequency of an alternating current D switching off the current in a circuit when there is a fault

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2023

28 Which device uses the magnetic effect of an electric current? A heater B lamp C relay D thermistor

1 marks

Answer: C

This question in 0625/12 Feb/March 2024

29 A transformer has 200 turns on its primary coil and is connected to a 240 V a.c. supply. The output voltage of the transformer is 60 V a.c. How many turns are on the secondary coil of the transformer? A 20 B 50 C 72 D 800

1 marks

Answer: B

This question in 0625/12 Feb/March 2024

30 A student moves a magnet into a coil, as shown. The voltmeter measures the magnitude of the electromotive force (e.m.f.) induced in the coil. coil S N magnet V Which quantity does not affect the magnitude of the induced e.m.f.? A the number of turns per unit length in the coil B the polarity of the magnet C the speed of the magnet D the strength of the magnet

1 marks

Answer: B

This question in 0625/11 May/June 2024

31 A student makes a small d.c. motor. The teacher supplies the following equipment. ● battery ● ammeter ● voltmeter ● coil of wire ● magnets ● resistor The student is also able to use other equipment if he wishes. Which equipment must be used? A ammeter, battery and resistor B ammeter, coil of wire and voltmeter C battery, coil of wire and magnets D magnets, resistor and voltmeter

1 marks

Answer: C

This question in 0625/11 May/June 2024

30 A transformer has 400 turns on the primary coil connected to the 240 V mains supply. There are two secondary coils to serve different parts of a television. Secondary coil 1 has 2500 turns and secondary coil 2 has 20 turns. Which row is correct? p.d. across p.d. across secondary coil 1 / V secondary coil 2 / V A 12 3.2 B 1500 12 C 4200 12 D 4200 33

1 marks

Answer: B

This question in 0625/13 May/June 2024

31 A class is designing a d.c. motor. To achieve a greater turning effect, three suggestions are made. 1 Have a larger current in the coil of the motor. 2 Have a stronger magnet in the motor. 3 Put a larger number of turns on the coil. Which suggestions will help to increase the turning effect? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: A

This question in 0625/13 May/June 2024

31 The diagrams show a strong magnet and a weak magnet moving into the same coil of wire at different speeds. arrangement X arrangement Y strong magnet weak magnet N S N S moving moving slowly slowly arrangement Z strong magnet N S moving quickly Which arrangement induces the largest electromotive force (e.m.f.) and which arrangement induces the smallest e.m.f.? largest smallest e.m.f. e.m.f. A X Y B Y Z C Z X D Z Y

1 marks

Answer: D

This question in 0625/11 Oct/Nov 2024

32 The diagrams show a current-carrying wire with an arrow in the direction of the current. Which diagram shows the magnetic field produced by the current? A B magnetic magnetic field lines field lines wire wire C D magnetic magnetic field lines field lines wire wire

1 marks

Answer: B

This question in 0625/11 Oct/Nov 2024

33 What are the best materials to use for the construction of a transformer? A copper for the core and steel for the coils wound around it B copper for the core and copper for the coils wound around it C soft iron for the core and copper for the coils wound around it D steel for the core and copper for the coils wound around it

1 marks

Answer: C

This question in 0625/11 Oct/Nov 2024

31 A straight wire is stationary between the poles of a magnet. It lies perpendicular to the magnetic field. wire magnet pole magnet pole Which action does not induce an e.m.f. in the wire? A moving the magnet up towards the top of the page and the wire down towards the bottom of the page B moving the magnet up towards the top of the page only C moving the wire and the magnet up towards the top of the page at the same speed D moving the wire down towards the bottom of the page only

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2024

32 The diagram shows a wire hanging vertically between the poles of a magnet. N S There is a current in the wire in the direction shown. The wire moves into the plane of the page away from the observer. In which direction does the wire move when the current is reversed? A The wire moves into the plane of the page, away from the observer. B The wire moves to the left. C The wire moves to the right. D The wire moves out of the plane of the page, towards the observer.

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2024

33 A current-carrying coil in a magnetic field experiences a turning effect. Students are asked how the turning effect can be increased. Three suggestions are listed. 1 decreasing the number of turns on the coil 2 increasing the current 3 increasing the strength of the magnetic field Which suggestions will increase the turning effect? A 1, 2 and 3 B 1 and 2 only C 1 and 3 only D 2 and 3 only

1 marks

Answer: D

This question in 0625/12 Oct/Nov 2024

29 Which symbol represents a device that contains a current-carrying coil in a magnetic field? A B C D M

1 marks

Answer: B

This question in 0625/13 Oct/Nov 2024

31 A student investigates electromagnetic induction. She moves the N pole of a magnet quickly towards a coil of wire. There is a reading on the sensitive voltmeter. coil of wire bar magnet S N V What can she do to get a greater reading on the sensitive voltmeter? A Hold the bar magnet stationary inside the coil. B Move the bar magnet slowly away from the coil. C Use a coil of wire with fewer turns on it. D Use a stronger bar magnet.

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2024

33 What does a step-up transformer increase? A current B energy C power D voltage

1 marks

Answer: D

This question in 0625/13 Oct/Nov 2024

35 A copper wire rests in a uniform magnetic field. Which change causes an induced electromotive force (e.m.f.) in the wire? A connecting the wire to a power supply B connecting the wire to earth C heating the wire D moving the wire

1 marks

Answer: D

This question in 0625/12 Feb/March 2025

32 A student investigates the turning effect on a current-carrying coil placed in a magnetic field. The student changes the current in the coil and the number of turns on the coil. Which two changes together must increase the turning effect? A decreasing the current and decreasing the number of turns B decreasing the current and increasing the number of turns C increasing the current and decreasing the number of turns D increasing the current and increasing the number of turns

1 marks

Answer: D

This question in 0625/11 May/June 2025

33 There is a current of 3.0 A in a conductor. The current is changed to 6.0 A in the opposite direction. Which effect does this have on the magnetic field around the conductor? A It decreases and it acts in the opposite direction. B It decreases and it acts in the same direction. C It increases and it acts in the opposite direction. D It increases and it acts in the same direction.

1 marks

Answer: C

This question in 0625/11 May/June 2025

32 The transformer in a laptop power supply is used to change mains voltage from 240 V to 20 V. The transformer has 600 turns on the secondary coil. Which type of transformer is it and how many turns does the transformer have on the primary coil? number of turns transformer type on primary coil A step-down 50 B step-down 7200 C step-up 50 D step-up 7200

1 marks

Answer: B

This question in 0625/12 May/June 2025

32 The transformer in a laptop power supply is used to change mains voltage from 240 V to 20 V. The transformer has 600 turns on the secondary coil. Which type of transformer is it and how many turns does the transformer have on the primary coil? number of turns transformer type on primary coil A step-down 50 B step-down 7200 C step-up 50 D step-up 7200

1 marks

Answer: B

This question in 0625/13 May/June 2025

32 The diagram shows a coil of insulated wire wrapped around a soft-iron rod. The wire is connected to a d.c. power supply as indicated. The apparatus is in a region which is totally shielded from the Earth’s magnetic field. + – soft-iron rod P A small compass needle is placed at point P. In which direction does the N pole of the compass needle point? A towards the bottom of the page B towards the left of the page C towards the right of the page D towards the top of the page

1 marks

Answer: C

This question in 0625/12 Oct/Nov 2025

33 Which components are used to construct an efficient simple transformer? A two insulated copper wire coils wound on a copper core B two insulated copper wire coils wound on an iron core C two insulated iron wire coils wound on a copper core D two insulated iron wire coils wound on an iron core

1 marks

Answer: B

This question in 0625/12 Oct/Nov 2025

34 A vertical wire passes through a hole in a piece of card. A plotting compass is placed on the card. There is no current in the circuit. wire card plotting compass Which diagram shows the plotting compass when the switch is closed? A B C D

1 marks

Answer: C

This question in 0625/13 Oct/Nov 2025