plumiElectromagnetic induction: AQA A‑Level Physics questions
AQA A-Level Physics past-paper questions on 3.7.5.4 Electromagnetic induction, 2008–2025, with mark schemes and examiner’s reports where available.
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All 72 questions on Electromagnetic induction, as a list
- June 2025, Paper 2, Q19 (1 mark): Four identical magnets slide down four ramps P, Q, R and S of the same length and width. The slope of each ramp is the same. The table shows the resistivity and
- June 2025, Paper 2, Q21 (1 mark): A coil rotates at a constant angular speed in a uniform horizontal magnetic field. The diagram shows the instant when the plane of the coil is horizontal. cross
- June 2025, Paper 2, Q22 (1 mark): A metal block has dimensions 30.0 cm × 10.0 cm × 5.0 cm as shown. The block is moved at a constant horizontal velocity of 5.0 cm s−1 through a uniform vertical
- June 2024, Paper 2, Q03.1 (3 marks): Figure 5 shows the arrangement. The rod has a length of 2.0 m. Figure 5 The rod is released and falls 8.0 m to the ground. It remains in a horizontal east–west
- June 2024, Paper 2, Q03.2 (4 marks): The rod is returned to its original position. It is now supported by a non-conducting pole that is hinged on the ground as shown in Figure 6. The pole is initia
- June 2023, Paper 2, Q22 (1 mark): The magnetic flux ϕ in a coil varies with time t as shown. Which graph shows how the emf ε induced in the coil varies with t? [1 mark] A B C D
- June 2023, Paper 2, Q23 (1 mark): The distance between the wing tips of a metal aircraft is 30 m. The aircraft flies horizontally at a steady speed of 100 m s−1. The aircraft passes through a ve
- June 2023, Paper 2, Q24 (1 mark): A circular coil with a radius of 0.10 m has 200 turns. The coil rotates at 50 revolutions per second about an axis which is perpendicular to a uniform magnetic
- June 2023, Paper 3A, Q03.1 (2 marks): Discuss whether a search coil is a suitable sensor to detect BH. [2 marks]
- June 2022, Paper 2, Q23 (1 mark): A coil is rotated at frequency f in a uniform magnetic field. The magnetic flux linking the coil is a maximum at time t1 and the emf induced in the coil is a ma
- November 2021, Paper 2, Q04.2 (2 marks): Explain what happens to the value of the emf as the search coil moves. [2 marks]
- November 2021, Paper 2, Q04.3 (4 marks): The search coil passes through the position where x = 0.10 m. Deduce whether the emf can exceed 5 mV for values of x greater than 0.10 m. [4 marks]
- November 2021, Paper 2, Q22 (1 mark): The diagram shows a square coil with its plane parallel to a uniform magnetic field. The coil always remains within the magnetic field. There are four possible
- November 2020, Paper 2, Q24 (1 mark): The diagram shows a small rectangular coil falling between two magnetic poles. The coil is shown at four instants as it passes through the magnetic field. At wh
- November 2020, Paper 2, Q25 (1 mark): An alternating emf is induced in a coil rotating in a magnetic field. What is the phase difference between the magnetic flux linkage through the coil and the em
- November 2020, Paper 2, Q26 (1 mark): The diagram shows the variation with time t of the magnetic flux density B of the field linking a coil. Which graph shows the variation of induced emf ε in the
- November 2020, Paper 2, Q27 (1 mark): A coil P is connected to a cell and a switch. A closed coil Q is parallel to P and is arranged on the same axis. Which describes the force acting on Q after the
- June 2019, Paper 2, Q05.3 (2 marks): The coil forms part of an electrical generator. Figure 5 shows the emf generated by the coil. Figure 5 Calculate the peak value of the emf generated. [2 marks]
- June 2019, Paper 2, Q05.4 (1 mark): Sketch on Figure 6 the variation with time of flux linkage for the same time interval as Figure 5. [1 mark] Figure 6
- June 2019, Paper 2, Q26 (1 mark): A coil P is connected to a cell and a switch. A second closed coil Q is parallel to P and is arranged on the same axis. When the switch is closed, coil Q experi
- June 2019, Paper 2, Q27 (1 mark): Three identical magnets P, Q and R are released simultaneously from rest and fall to the ground from the same height. P falls directly to the ground. Q falls th
- June 2018, Paper 2, Q04.1 (1 mark): State Lenz’s law. [1 mark]
- June 2018, Paper 2, Q04.2 (1 mark): Lenz’s law can be demonstrated using a bar magnet and a coil of wire connected to a sensitive ammeter as shown in Figure 6. Figure 6 The bar magnet is moved tow
- June 2018, Paper 2, Q04.3 (2 marks): During the demonstration an induced current is detected by the ammeter. The induced current is in the direction E to F. Explain how this demonstrates Lenz’s law
- June 2018, Paper 2, Q04.4 (2 marks): Figure 7 shows an arrangement for investigating induced emf. Figure 7 As shown, the uniform vertical magnetic field is confined to the gap between the poles of
- June 2018, Paper 2, Q04.5 (2 marks): The square coil is rotated through 360° at a constant angular speed about the horizontal axis shown in Figure 9. Figure 9 Calculate the angular speed of the coi
- June 2017, Paper 2, Q22 (1 mark): A coil with 20 circular turns each of diameter 60 mm is placed in a uniform magnetic field of flux density 90 mT. Initially the plane of the coil is perpendicul
- Specimen, Paper 2, Q05.1 (4 marks): An ‘Earth inductor’ consists of a 500 turn coil. Figure 4 and Figure 5 shows it set up to measure the horizontal component of the Earth’s magnetic field. When t
- Specimen, Paper 2, Q05.2 (3 marks): Figure 3 shows an arrangement for investigating electromagnetic induction. Figure 3 When the switch is closed there is a current in the coil in circuit X. The c
- Specimen, Paper 2, Q20 (1 mark): A vertical conducting rod of length l is moved at a constant velocity v through a uniform horizontal magnetic field of flux density B. Which of the rows gives a
- Specimen, Paper 2, Q22 (1 mark): The graph shows how the flux linkage, NФ, through a coil changes when the coil is moved into a magnetic field. The emf induced in the coil [1 mark] A decreases
- June 2016, PHYA4 Section A (old spec), Q23 (1 mark): A train is travelling at 20 m s–1 along a horizontal track through a uniform magnetic field of flux density 4.0 × 10–5 T acting vertically downwards. What is th
- June 2016, PHYA4 Section B (old spec), Q5(a) (3 marks): State, in words, the two laws of electromagnetic induction. [3 marks] Law 1 ________________________________________________________________________ ___________
- June 2016, PHYA4 Section B (old spec), Q5(b)(i) (3 marks): Explain, using the laws of electromagnetic induction, how the device in Figure 4 acts as an electromagnetic brake. [3 marks] ___________________________________
- June 2016, PHYA4 Section B (old spec), Q5(b)(ii) (2 marks): A conventional braking system has friction pads that are brought into contact with a moving metal surface when the vehicle is to be slowed down. State one advan
- June 2015, PHYA4 Section B (old spec), Q4(a)(i) (3 marks): Initially the variable resistor is set to its minimum resistance and S is open. Describe and explain what is observed on the ammeter when S is closed. [3 marks]
- June 2015, PHYA4 Section B (old spec), Q4(a)(ii) (2 marks): With S still closed, the resistance of the variable resistor is suddenly increased. Compare what is now observed on the ammeter with what was observed in part (
- June 2015, PHYA4 Section B (old spec), Q4(b)(ii) (2 marks): The coil is rotated through 90º in a time of 0.50 s. Determine the mean emf in the coil. [2 marks] mean emf V
- June 2014, PHYA4 Section A (old spec), Q22 (1 mark): In which one of the following applications does electromagnetic induction not take place? A the generators at a nuclear power station B the ac power adapter for
- June 2014, PHYA4 Section A (old spec), Q23 (1 mark): When a magnet is dropped through an aluminium ring an emf is induced. A data logger connected to the ring records the variation of the induced emf ε with time t
- June 2014, PHYA4 Section A (old spec), Q24 (1 mark): A rectangular coil of area A has N turns of wire. The coil is in a uniform magnetic field, as shown in the diagram. When the coil is rotated at a constant frequ
- June 2013, PHYA4 Section A (old spec), Q24 (1 mark): A vertical conducting rod of length l is moved at a constant velocity v through a uniform horizontal magnetic field of flux density B. Which line, A to D, in th
- June 2013, PHYA4 Section B (old spec), Q5(a)(i) (1 mark): State the minimum angle, in degrees, through which the coil must rotate from its position in Figure 3 for the emf to reach its maximum value. angle degrees (1 m
- June 2013, PHYA4 Section B (old spec), Q5(b)(i) (1 mark): What physical quantity is represented by the gradient of the graph shown in Figure 4? (1 mark)
- June 2013, PHYA4 Section B (old spec), Q5(b)(ii) (2 marks): Calculate the number of revolutions per minute made by the coil. revolutions per minute (2 marks) Figure 4 Figure 5 – 0. 5 0. 5 0 flux linkage / Wb turns 20 40
- June 2013, PHYA4 Section B (old spec), Q5(b)(iii) (3 marks): Calculate the peak value of the emf generated. peak emf V (3 marks)
- June 2013, PHYA4 Section B (old spec), Q5(c) (2 marks): Sketch a graph on the axes shown in Figure 5 above to show how the induced emf varies with time over the time interval shown in Figure 4. (2 marks)
- January 2013, PHYA4 Section A (old spec), Q22 (1 mark): A rectangular coil is rotated in a uniform magnetic field. When the coil is rotated at a constant rate, an alternating emf ε is induced in it. The variation of
- January 2013, PHYA4 Section A (old spec), Q23 (1 mark): The magnetic flux through a coil of 5 turns changes uniformly from 15 × 10–3 Wb to 7.0 × 10–3Wb in 0.50s. What is the magnitude of the emf induced in the coil d
- January 2013, PHYA4 Section B (old spec), Q5(a) (2 marks): State Lenz’s law. (2 marks)
- January 2013, PHYA4 Section B (old spec), Q5(c)(i) (2 marks): Explain why you would expect an emf to be induced in the tube as Q passes through it. (2 marks)
- January 2013, PHYA4 Section B (old spec), Q5(c)(ii) (3 marks): State the consequences of this induced emf, and hence explain why Q takes longer than P to pass through the tube.
- January 2013, PHYA4 Section B (old spec), Q5(d) (3 marks): The copper tube is replaced by a tube of the same dimensions made from brass. The resistivity of brass is much greater than that of copper. Describe and explain
- June 2012, PHYA4 Section A (old spec), Q22 (1 mark): Three vertical tubes, made from copper, lead and rubber respectively, have identical dimensions. Identical, strong, cylindrical magnets P, Q and R are released
- June 2012, PHYA4 Section A (old spec), Q23 (1 mark): The graph shows how the magnetic flux, Φ, passing through a coil changes with time, t. Which one of the following graphs could show how the magnitude of the emf
- June 2012, PHYA4 Section A (old spec), Q24 (1 mark): Using the circuit shown, and with the switch closed, a small current was passed through the coil X. The current was slowly increased using the variable resistor
- January 2012, PHYA4 Section A (old spec), Q24 (1 mark): The output electromotive force (emf) of a simple ac generator can be increased by any of the four factors listed. Which one of these factors should not be chang
- January 2012, PHYA4 Section B (old spec), Q4(b)(i) (6 marks): By reference to the laws of electromagnetic induction explain l why a current will be induced in the ring, l why the ring experiences a force that moves it upwa
- January 2012, PHYA4 Section B (old spec), Q4(b)(ii) (2 marks): What would happen to the ring if the alternating current in the coil was increased without changing the frequency? Explain your answer. (2 marks)
- June 2011, PHYA4 Section A (old spec), Q22 (1 mark): The graph shows how the flux linkage, NΦ, through a coil changes when the coil is moved into a magnetic field. The emf induced in the coil A increases then beco
- June 2011, PHYA4 Section A (old spec), Q23 (1 mark): A bar magnet is pushed into a coil connected to a sensitive ammeter, as shown in the diagram, until it comes to rest inside the coil. Why does the ammeter brief
- June 2011, PHYA4 Section A (old spec), Q24 (1 mark): The above graph shows how the output emf, ε, varies with time, t, for a coil rotating at angular speed ω in a uniform magnetic field of flux density B. Which on
- January 2011, PHYA4 Section A (old spec), Q22 (1 mark): An aircraft, of wing span 60m, flies horizontally at a speed of 150ms–1. If the vertical component of the Earth’s magnetic field in the region of the plane is 1
- January 2011, PHYA4 Section A (old spec), Q23 (1 mark): Three identical magnets P, Q and R are released simultaneously from rest and fall to the ground from the same height. P falls directly to the ground, Q falls th
- June 2010, PHYA4 Section A (old spec), Q23 (1 mark): The graph shows how the magnetic flux passing through a loop of wire changes with time. What feature of the graph represents the magnitude of the emf induced in
- June 2010, PHYA4 Section A (old spec), Q24 (1 mark): A coil rotating in a magnetic field produces the following voltage waveform when connected to an oscilloscope. With the same oscilloscope settings, which one of
- June 2010, PHYA4 Section B (old spec), Q5(b)(i) (1 mark): Sketch a graph on the outline axes to show how the induced emf varies with angle θ during one complete rotation of the coil, starting when θ = 0. Values are not
- June 2010, PHYA4 Section B (old spec), Q5(b)(iii) (3 marks): Explain why the magnitude of the emf is greatest at the values of θ shown in your answer to part (b)(i).
- January 2010, PHYA4 Section A (old spec), Q24 (1 mark): The magnetic flux through a coil of N turns is increased uniformly from zero to a maximum value in a time t. An emf, E, is induced across the coil. What is the
- January 2010, PHYA4 Section A (old spec), Q25 (1 mark): An aircraft, of wing span 60m, flies horizontally at a speed of 150ms–1, If the vertical component of the Earth’s magnetic field in the region of the plane is 1
- June 2008, PA04B (2008 spec), Q4(b) (5 marks): 4 (b) The wire is disconnected from the current source and its ends are connected to a sensitive voltmeter. When the wire is moved rapidly, vertically upwards a
- June 2008, PA10 (2008 spec), Q1(b) (5 marks): 1 (b) (i) Braking of the car is assisted by a generator which is turned by the car wheels. The generator transfers part of the car’s kinetic energy to a battery
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