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Electromagnetism: OCR A‑Level Physics A questions

Every OCR A-Level Physics A exam question on 6.3.3 Electromagnetism, 2016–2025, with its mark scheme and examiner’s report.

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1,877 questions

  1. Q21(a)

    June 2025 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2025 Paper 2, question 21(a): Which position on the signal, A, B or C, corresponds to the generator position shown below? Rotation Axle N S Coil view from end of coil Tick one box. A B C [1]

  2. Q21(b)

    June 2025 · Paper 2

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2025 Paper 2, question 21(b): Draw on Fig. 21.1 to show how the signal would change if the coil is rotated at a steady, faster rate. [2]

  3. Q21(c)(i)

    June 2025 · Paper 2

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2025 Paper 2, question 21(c)(i): Calculate the change in flux linkage. Change in flux linkage = Wb [2]

  4. Q21(c)(ii)

    June 2025 · Paper 2

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2025 Paper 2, question 21(c)(ii): Calculate the average induced electromotive force (e.m.f.) ε across the contacts of the coil. ε = V [2]

  5. Q3(a)

    June 2025 · Paper 3

    3 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2025 Paper 3, question 3(a): A proposed method for storing energy uses trucks powered by electric motors. The trucks carry sand up a mountain, storing surplus energy as gravitational potent

  6. Q18(a)

    June 2024 · Paper 2

    6 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2024 Paper 2, question 18(a): Describe how an experiment can be conducted to determine how the output current of a step‑up transformer depends on the number of turns on the secondary coil. E

  7. Q18(b)(i)

    June 2024 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2024 Paper 2, question 18(b)(i): State Faraday’s law. [1]

  8. Q18(b)(ii)

    June 2024 · Paper 2

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2024 Paper 2, question 18(b)(ii): Show that the number of turns on the secondary coil is 20. [2]

  9. Q18(b)(iii)

    June 2024 · Paper 2

    4 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2024 Paper 2, question 18(b)(iii): At one particular instant, the output voltage from the transformer is 3.4 V. Calculate the change in magnetic flux experienced by the secondary coil in a short

  10. Q4(c)(i)

    June 2024 · Paper 3

    3 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2024 Paper 3, question 4(c)(i): As magnet M oscillates, it moves in and out of coil Y. The magnet L also begins to oscillate. Explain why L oscillates. [3]

  11. Q12

    June 2023 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2023 Paper 2, question 12: The diagram shows a coil of wire rotating between two permanent magnets in a model generator. The coil is rotating clockwise about point P at constant angular v

  12. Q14

    June 2023 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2023 Paper 2, question 14: A step-down transformer has an input potential difference of 200 V. There are 250 turns on the primary coil and 50 turns on the secondary coil. The secondary co

  13. Q15

    June 2023 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2023 Paper 2, question 15: Which statement is Faraday’s law? A The direction of electric current induced by a changing magnetic field is such that the magnetic field created by the induce

  14. Q21(a)

    June 2022 · Paper 2

    3 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2022 Paper 2, question 21(a): The diagram below shows two insulated-copper coils A and B connected in circuits. A B iron rod Both coils are individually wrapped around the same iron rod. Coi

  15. Q21(b)(i)

    June 2022 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    June 2022 Paper 2, question 21(b)(i): Name an instrument that can be used to determine E0. [1]

  16. Q21(b)(ii)

    June 2022 · Paper 2

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    June 2022 Paper 2, question 21(b)(ii): The equation for E0 is: E0 = KI0ANf sin θ where I0 = maximum current in the solenoid, A = cross-sectional area of the search coil, N = number of turns of the se

  17. Q21(b)(iii)

    June 2022 · Paper 2

    4 marks6.3.3 Electromagnetism2.2.1 Measurements and uncertainties
    The whole paper ↗
    June 2022 Paper 2, question 21(b)(iii): The student plots a straight-line graph of E0 against sin θ. Determine f, including the absolute uncertainty. Write your value of f to 2 significant figures. I0

  18. Q1

    November 2021 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    November 2021 Paper 2, question 1: Faraday’s law of electromagnetic induction is written below with two terms missing. The induced in a circuit is directly proportional to the rate of change of m

  19. Q12

    November 2021 · Paper 2

    1 mark6.3.3 Electromagnetism
    The whole paper ↗
    November 2021 Paper 2, question 12: A flat coil has 200 turns and a cross-sectional area of 1.20 × 10–4 m2. magnetic 30° 30° field line coil The coil is placed horizontally in a uniform magnetic f

  20. Q4(b)(ii)

    November 2021 · Paper 3

    2 marks6.3.3 Electromagnetism
    The whole paper ↗
    November 2021 Paper 3, question 4(b)(ii): Fig. 4.3 shows the path of the large alternating current induced in the metal base of the saucepan. induced alternating current Fig. 4.3 Explain the origin of t
All 35 questions on Electromagnetism, as a list
  1. June 2025, Paper 2, Q21(a) (1 mark): Which position on the signal, A, B or C, corresponds to the generator position shown below? Rotation Axle N S Coil view from end of coil Tick one box. A B C [1]
  2. June 2025, Paper 2, Q21(b) (2 marks): Draw on Fig. 21.1 to show how the signal would change if the coil is rotated at a steady, faster rate. [2]
  3. June 2025, Paper 2, Q21(c)(i) (2 marks): Calculate the change in flux linkage. Change in flux linkage = Wb [2]
  4. June 2025, Paper 2, Q21(c)(ii) (2 marks): Calculate the average induced electromotive force (e.m.f.) ε across the contacts of the coil. ε = V [2]
  5. June 2025, Paper 3, Q3(a) (3 marks): A proposed method for storing energy uses trucks powered by electric motors. The trucks carry sand up a mountain, storing surplus energy as gravitational potent
  6. June 2024, Paper 2, Q18(a) (6 marks): Describe how an experiment can be conducted to determine how the output current of a step‑up transformer depends on the number of turns on the secondary coil. E
  7. June 2024, Paper 2, Q18(b)(i) (1 mark): State Faraday’s law. [1]
  8. June 2024, Paper 2, Q18(b)(ii) (2 marks): Show that the number of turns on the secondary coil is 20. [2]
  9. June 2024, Paper 2, Q18(b)(iii) (4 marks): At one particular instant, the output voltage from the transformer is 3.4 V. Calculate the change in magnetic flux experienced by the secondary coil in a short
  10. June 2024, Paper 3, Q4(c)(i) (3 marks): As magnet M oscillates, it moves in and out of coil Y. The magnet L also begins to oscillate. Explain why L oscillates. [3]
  11. June 2023, Paper 2, Q12 (1 mark): The diagram shows a coil of wire rotating between two permanent magnets in a model generator. The coil is rotating clockwise about point P at constant angular v
  12. June 2023, Paper 2, Q14 (1 mark): A step-down transformer has an input potential difference of 200 V. There are 250 turns on the primary coil and 50 turns on the secondary coil. The secondary co
  13. June 2023, Paper 2, Q15 (1 mark): Which statement is Faraday’s law? A The direction of electric current induced by a changing magnetic field is such that the magnetic field created by the induce
  14. June 2022, Paper 2, Q21(a) (3 marks): The diagram below shows two insulated-copper coils A and B connected in circuits. A B iron rod Both coils are individually wrapped around the same iron rod. Coi
  15. June 2022, Paper 2, Q21(b)(i) (1 mark): Name an instrument that can be used to determine E0. [1]
  16. June 2022, Paper 2, Q21(b)(ii) (2 marks): The equation for E0 is: E0 = KI0ANf sin θ where I0 = maximum current in the solenoid, A = cross-sectional area of the search coil, N = number of turns of the se
  17. June 2022, Paper 2, Q21(b)(iii) (4 marks): The student plots a straight-line graph of E0 against sin θ. Determine f, including the absolute uncertainty. Write your value of f to 2 significant figures. I0
  18. November 2021, Paper 2, Q1 (1 mark): Faraday’s law of electromagnetic induction is written below with two terms missing. The induced in a circuit is directly proportional to the rate of change of m
  19. November 2021, Paper 2, Q12 (1 mark): A flat coil has 200 turns and a cross-sectional area of 1.20 × 10–4 m2. magnetic 30° 30° field line coil The coil is placed horizontally in a uniform magnetic f
  20. November 2021, Paper 3, Q4(b)(ii) (2 marks): Fig. 4.3 shows the path of the large alternating current induced in the metal base of the saucepan. induced alternating current Fig. 4.3 Explain the origin of t
  21. November 2021, Paper 3, Q4(b)(iii) (2 marks): Explain why it would be safe for a person to place a hand on the cooking area before the saucepan is put onto it. [2]
  22. November 2020, Paper 2, Q22(b)(i) (1 mark): State Faraday’s law of electromagnetic induction. [1]
  23. November 2020, Paper 2, Q22(b)(ii) (3 marks): The diagram below shows a simple transformer constructed by a student. primary coil secondary coil soft-iron core Describe how the student can do an experiment
  24. June 2019, Paper 2, Q10 (1 mark): A coil with 500 turns is placed in a uniform magnetic field. The average cross-sectional area of the coil is 3.0 × 10–4 m2. The magnetic flux through the plane
  25. June 2019, Paper 2, Q15 (1 mark): The number of turns on the coils of four ideal iron-cored transformers A, B, C and D are shown in the table below. Transformer Number of turns on Number of turn
  26. June 2019, Paper 3, Q3(a) (3 marks): Explain the shape of the curve in Fig. 3.3. [3]
  27. June 2018, Paper 2, Q21(a)(i) (1 mark): Explain why the electromotive force (e.m.f.) induced across the ends of the coil is a maximum at the times when B = 0. [1]
  28. June 2018, Paper 2, Q21(a)(ii) (3 marks): Draw a tangent to the curve in Fig. 21.2 when B = 0, and hence determine the maximum e.m.f. induced across the ends of the coil. maximum e.m.f. = V [3]
  29. June 2018, Paper 2, Q21(b) (2 marks): Fig. 21.3 shows the variation of the e.m.f. induced across the ends of the coil with time t. e.m.f 0 0 10 20 30 t / ms Fig. 21.3 The magnitude of the magnetic f
  30. June 2018, Paper 3, Q5(a)(i) (2 marks): Explain the shape of the graph in terms of the magnetic flux linking the coil. [2]
  31. June 2018, Paper 3, Q5(a)(ii) (1 mark): On Fig. 5.3 sketch a graph of the magnetic flux linkage of the coil against time. The variation of the induced e.m.f. across the coil is shown as a dotted line.
  32. June 2018, Paper 3, Q5(a)(iii) (2 marks): The coil shown in Fig. 5.1 has 150 turns. The maximum induced e.m.f. V0 across the coil is 1.2 V when the magnet is rotating at 24 revolutions per second. Calcu
  33. June 2018, Paper 3, Q5(b) (6 marks): (b)* A student is given a transformer with coils X and Y, as shown in Fig. 5.4. soft iron core X Y Fig. 5.4 The student is intending to investigate how the maxi
  34. June 2017, Paper 2, Q22(b)(i) (3 marks): Use Faraday’s law of electromagnetic induction to explain why the filament lamp is lit. [3]
  35. June 2017, Paper 2, Q22(b)(ii) (4 marks): The primary coil has 400 turns and the secondary coil has 20 turns. The potential difference across the lamp is 12 V and it dissipates 24 W. The transformer is

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