plumiFaraday’s and Lenz’s laws: Edexcel International A Level Physics questions
Edexcel International A Level Physics past-paper questions on 4.4.4.2 Faraday’s and Lenz’s laws, 2019–2025, with mark schemes and examiner’s reports where available.
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Q18(b)
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All 31 questions on Faraday’s and Lenz’s laws, as a list
- January 2025, Unit 4, Q18(b) (5 marks): The card reader can determine the orientation of a magnetic pole if the reading on –6 V. the voltage sensor is greater than 1.5 × 10 The key card is moved down
- October 2024, Unit 4, Q15(b)(ii) (5 marks): The student replaces the sensitive voltmeter with a different voltmeter, with a resolution of 0.1 V. The coil makes one quarter of a turn, from a horizontal pos
- June 2024, Unit 4, Q18(b) (5 marks): The distance across the gap in the spark plug is 0.75 mm. Calculate the electric field strength in the gap when the switch is opened. Assume the electric field
- June 2024, Unit 4, Q18(c) (3 marks): When the switch in the circuit is closed, the current increases to a maximum value, as shown. Current Time Explain why the current does not increase to its maxi
- January 2024, Unit 4, Q8 (1 mark): A magnet is moved away from a coil, as shown. mA direction of N S movement X Y A current is produced in the coil, which creates a magnetic field around the coil
- January 2024, Unit 4, Q16 (4 marks): As an aeroplane flies through the Earth’s magnetic field, an e.m.f. is induced across the wing tips. An aeroplane is flying with a velocity v, at 90° to the ver
- January 2024, Unit 4, Q21(a) (6 marks): The idea of the induction cooker was first suggested more than a century ago. An iron kettle was heated by passing an alternating current through a coil wound a
- October 2023, Unit 4, Q16 (6 marks): *16 A bar magnet was dropped vertically through a small coil, as shown. S bar magnet N coil The coil was attached to a data logger. The data logger recorded the
- October 2023, Unit 4, Q17(a) (3 marks): Calculate the e.m.f. induced across the copper rod. B = 150 mT v = 3.5 × 10 –2 m s –1 d = 7.5 cm (3) Induced e.m.f. =
- October 2023, Unit 4, Q17(b) (3 marks): Explain the direction of the induced e.m.f. (3)
- June 2023, Unit 4, Q16(c) (4 marks): The graph shows the magnetic flux in the coil while the coil was being rotated. 10.00 Magnetic flux / 10 –5 Wb 9.00 8.00 7.00 6.00 5.00 4.00 3.00 2.00 1.00 0.00
- June 2023, Unit 4, Q16(d) (4 marks): The output terminals of the coil are connected together, while the coil is in the magnetic field. The diagram shows a cross‑section through one turn of the coil
- January 2023, Unit 4, Q15(a) (6 marks): When the student moved the wire quickly downwards between the magnets, the reading on the balance changed. Explain how the reading on the balance changed. (6)
- January 2023, Unit 4, Q15(b) (5 marks): A voltmeter was connected across the ends of a second wire. The student moved this wire vertically downwards between the magnets at a constant speed. A potentia
- October 2022, Unit 4, Q14 (6 marks): *14 A student uses a strong, cylindrical magnet to investigate Lenz’s law. The student records the time taken for the magnet to fall through two hollow tubes of
- June 2022, Unit 4, Q18(b)(ii) (2 marks): The kinetic energy of the vehicle decreased as the aluminium plate moved between the poles of the magnet. Explain why. (2)
- June 2022, Unit 4, Q18(c)(i) (2 marks): Show that the percentage reduction in kinetic energy is proportional to the thickness of the plate. (2)
- June 2022, Unit 4, Q18(c)(ii) (3 marks): Suggest why the percentage reduction in kinetic energy increases as the thickness of the plate increases. (3)
- January 2022, Unit 4, Q18(b) (6 marks): A coil of 500 turns and radius 3.0 mm is placed between two poles of an electromagnet as shown. The terminals are connected to an a.c. power supply. coil termin
- January 2022, Unit 4, Q18(c) (6 marks): Some electric motor designs rely on electromagnetic induction. A laboratory demonstration of the principle of an induction motor is shown. An aluminium disc is
- January 2022, Unit 6, Q2(a) (6 marks): The student had a large number of copper tubes of different lengths x. He predicted that the magnet would fall with constant acceleration a inside the copper tu
- October 2021, Unit 4, Q15(b) (5 marks): Just before the carriage reaches the end of the ride it is slowed by an electromagnetic brake. Powerful magnets are attached to the track. An aluminium fin is a
- June 2021, Unit 4, Q14 (6 marks): *14 A student carried out an investigation of Lenz’s law. A copper tube was suspended from a force meter, as shown. A magnet was released at the top of the tub
- January 2021, Unit 4, Q16(a) (4 marks): Explain how steadily increasing the current in the central coil produces a current in the plasma. (4)
- January 2021, Unit 4, Q16(b)(ii) (4 marks): In a particular experiment, the current in the central coil is increased steadily from zero to its maximum value in a time of 25.0 s. When the current in the ce
- October 2020, Unit 4, Q10 (1 mark): A magnet is dropped vertically through a coil, producing a current in the coil which creates a magnetic field around it. S N X A Y Which line of the table corre
- October 2020, Unit 4, Q15(b)(i) (6 marks): The transformer T consists of two coils wound around a single iron core. An alternating p.d. is applied to the input coil and the output coil is connected, thro
- October 2020, Unit 4, Q15(b)(ii) (3 marks): The graph shows how the magnetic flux density B in the iron core varies with time. 10.0 8.0 6.0 4.0 2.0 B / 10–3 T 0.0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 t / 10–5 s
- January 2020, Unit 4, Q18(a) (4 marks): Explain this observation. (4)
- January 2020, Unit 4, Q18(b)(i) (2 marks): Add to the graph to show the output if the angular velocity of the generator coil is halved. (2)
- January 2020, Unit 4, Q18(b)(iii) (4 marks): The coil rotates in a uniform magnetic field at the original angular velocity. The average magnitude of V is 3.2 V. Determine the number of turns in the coil. m
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