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Electromagnetic induction: WJEC A‑Level Physics questions

Every WJEC A-Level Physics exam question on 4.5 Electromagnetic induction, 2016–2025, with its mark scheme and examiner’s report.

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Calculations

1,173 questions

  1. Q5(a)

    Summer 2025 · Unit 4

    4 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2025 Unit 4, question 5(a): By considering the motion of the magnet between positions 1 and 3, explain why the induced emf in the coil varies as shown in the graph. [4]

  2. Q5(b)

    Summer 2025 · Unit 4

    3 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2025 Unit 4, question 5(b): The flux linkages of the coil in positions 1 and 2 are 0.84 Wb turn and 1.47 Wb turn respectively. The magnet takes 13.2 ms to move from position 1 to position

  3. Q6(a)

    Summer 2024 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2024 Unit 4, question 6(a): The diagram shows a metal bar moving with velocity, v, through a uniform magnetic field, B. metal bar d B -field, out of paper velocity, v Show that the rate of

  4. Q6(b)(i)

    Summer 2024 · Unit 4

    3 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2024 Unit 4, question 6(b)(i): Use the expression in part (a) to explain why the induced emf in the square metallic loop is given by: [3] (B2 – B1)vd

  5. Q6(b)(ii)

    Summer 2024 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2024 Unit 4, question 6(b)(ii): The B -field, through which the square metal loop moves, increases with distance at a rate of 1.20 T m−1 (in the direction of the velocity). The square loop has

  6. Q5(a)

    Summer 2023 · Unit 4

    4 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2023 Unit 4, question 5(a): The diagram shows how conductors can be heated using a varying magnetic field. induced current heated object current n f e t i c induction coil high frequency a

  7. Q1(b)(i)

    Summer 2022 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2022 Unit 4, question 1(b)(i): Calculate the flux linkage of the coil when θ = 23°. [2]

  8. Q1(b)(ii)

    Summer 2022 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2022 Unit 4, question 1(b)(ii): As the coil rotates, explain what values of θ provide the maximum and minimum values of the induced emf. [2]

  9. Q5(a)

    Summer 2019 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2019 Unit 4, question 5(a): State the laws of Faraday and Lenz for electromagnetic induction. [2]

  10. Q5(b)

    Summer 2019 · Unit 4

    6 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2019 Unit 4, question 5(b): Two strong bar magnets are dropped through two copper pipes (P and Q). Pipe P has a slit running along its length but Q is complete. When the magnet is dropped

  11. Q5(c)

    Summer 2019 · Unit 4

    4 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2019 Unit 4, question 5(c): By applying the principle of conservation of energy, calculate the temperature increase of pipe Q after the magnet has fallen at constant speed. [4] Data: • mas

  12. Q5(a)(i)

    Summer 2018 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2018 Unit 4, question 5(a)(i): Show that a mean emf of 6.4 V is induced in the coat hanger. [2]

  13. Q5(a)(ii)

    Summer 2018 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2018 Unit 4, question 5(a)(ii): Show on the diagram of Shape 2 the direction of the induced current and state very briefly how you determined this direction. [2]

  14. Q5(d)

    Summer 2018 · Unit 4

    3 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2018 Unit 4, question 5(d): For medical research, it is decided to investigate the effect of this strong magnetic field (2.1 T) on patients with metal replacement joints to see if the meta

  15. Q5(a)(i)

    Summer 2017 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2017 Unit 4, question 5(a)(i): Explain why a current is detected by the ammeter. [2]

  16. Q5(a)(ii)

    Summer 2017 · Unit 4

    1 mark4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2017 Unit 4, question 5(a)(ii): State why the current is independent of the horizontal component of the Earth’s magnetic field. [1]

  17. Q5(b)

    Summer 2017 · Unit 4

    3 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2017 Unit 4, question 5(b): Calculate a value for the vertical component of the Earth’s magnetic field given that the reading on the ammeter is 184 μA. [3]

  18. Q5(c)

    Summer 2017 · Unit 4

    2 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2017 Unit 4, question 5(c): State the direction of the current in the resistor and how you obtained this direction. [2]

  19. Q5(d)

    Summer 2017 · Unit 4

    4 marks4.5 Electromagnetic induction
    The whole paper ↗
    Summer 2017 Unit 4, question 5(d): A student suggests that the opposing force due to the magnetic field on the moving conductor is negligible compared with other resistive forces. Is the student
All 19 questions on Electromagnetic induction, as a list
  1. Summer 2025, Unit 4, Q5(a) (4 marks): By considering the motion of the magnet between positions 1 and 3, explain why the induced emf in the coil varies as shown in the graph. [4]
  2. Summer 2025, Unit 4, Q5(b) (3 marks): The flux linkages of the coil in positions 1 and 2 are 0.84 Wb turn and 1.47 Wb turn respectively. The magnet takes 13.2 ms to move from position 1 to position
  3. Summer 2024, Unit 4, Q6(a) (2 marks): The diagram shows a metal bar moving with velocity, v, through a uniform magnetic field, B. metal bar d B -field, out of paper velocity, v Show that the rate of
  4. Summer 2024, Unit 4, Q6(b)(i) (3 marks): Use the expression in part (a) to explain why the induced emf in the square metallic loop is given by: [3] (B2 – B1)vd
  5. Summer 2024, Unit 4, Q6(b)(ii) (2 marks): The B -field, through which the square metal loop moves, increases with distance at a rate of 1.20 T m−1 (in the direction of the velocity). The square loop has
  6. Summer 2023, Unit 4, Q5(a) (4 marks): The diagram shows how conductors can be heated using a varying magnetic field. induced current heated object current n f e t i c induction coil high frequency a
  7. Summer 2022, Unit 4, Q1(b)(i) (2 marks): Calculate the flux linkage of the coil when θ = 23°. [2]
  8. Summer 2022, Unit 4, Q1(b)(ii) (2 marks): As the coil rotates, explain what values of θ provide the maximum and minimum values of the induced emf. [2]
  9. Summer 2019, Unit 4, Q5(a) (2 marks): State the laws of Faraday and Lenz for electromagnetic induction. [2]
  10. Summer 2019, Unit 4, Q5(b) (6 marks): Two strong bar magnets are dropped through two copper pipes (P and Q). Pipe P has a slit running along its length but Q is complete. When the magnet is dropped
  11. Summer 2019, Unit 4, Q5(c) (4 marks): By applying the principle of conservation of energy, calculate the temperature increase of pipe Q after the magnet has fallen at constant speed. [4] Data: • mas
  12. Summer 2018, Unit 4, Q5(a)(i) (2 marks): Show that a mean emf of 6.4 V is induced in the coat hanger. [2]
  13. Summer 2018, Unit 4, Q5(a)(ii) (2 marks): Show on the diagram of Shape 2 the direction of the induced current and state very briefly how you determined this direction. [2]
  14. Summer 2018, Unit 4, Q5(d) (3 marks): For medical research, it is decided to investigate the effect of this strong magnetic field (2.1 T) on patients with metal replacement joints to see if the meta
  15. Summer 2017, Unit 4, Q5(a)(i) (2 marks): Explain why a current is detected by the ammeter. [2]
  16. Summer 2017, Unit 4, Q5(a)(ii) (1 mark): State why the current is independent of the horizontal component of the Earth’s magnetic field. [1]
  17. Summer 2017, Unit 4, Q5(b) (3 marks): Calculate a value for the vertical component of the Earth’s magnetic field given that the reading on the ammeter is 184 μA. [3]
  18. Summer 2017, Unit 4, Q5(c) (2 marks): State the direction of the current in the resistor and how you obtained this direction. [2]
  19. Summer 2017, Unit 4, Q5(d) (4 marks): A student suggests that the opposing force due to the magnetic field on the moving conductor is negligible compared with other resistive forces. Is the student

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