Lesson 7.5.2

7.5.2 Faraday's law and Lenz's law Quiz: Pearson Edexcel Physics, Unit 7

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 7.5.2, Faraday's law and Lenz's law: 20 multiple choice questions for the Pearson Edexcel Physics (9PH0), Unit 7: Electric and Magnetic Fields, written with Revision Ninja.

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The 20 questions

  1. Faraday's law states that induced e.m.f. is equal to which quantity?

    • Magnetic flux density
    • Total flux linkage
    • Current density
    • Flux change rate

  2. What does Lenz's law state that the induced e.m.f. always opposes?

    • Change in flux
    • Magnetic flux density
    • Direction of motion
    • Applied potential difference

  3. Which fundamental conservation law is directly expressed by Lenz's law?

    • Conservation of mass
    • Conservation of momentum
    • Conservation of charge
    • Conservation of energy

  4. What physical law is represented by the minus sign in Faraday's law equation?

    • Gauss's law
    • Newton's first law
    • Lenz's law
    • Ampere's law

  5. When a magnet's north pole approaches a coil, what pole is induced on the nearest face?

    • Neutral pole
    • North pole
    • Alternating pole
    • South pole

  6. The flux through each turn of a 100-turn coil changes from 0.020 Wb to 0.080 Wb in 0.40 s. What is the average induced e.m.f.?

    • 0.15 V
    • 15 V
    • 1.5 V
    • 150 V

  7. The flux linkage through a coil falls from 3.0 Wb to zero in 0.60 s. What is the magnitude of the average induced e.m.f.?

    • 18 V
    • 1.8 V
    • 5.0 V
    • 0.20 V

  8. The flux linkage through a coil decreases steadily at 2.0 Wb s^-1. What is the magnitude of the induced e.m.f.?

    • -2.0 V
    • 4.0 V
    • 2.0 V
    • 0.50 V

  9. What quantity is represented by the gradient of a flux linkage against time graph?

    • Total magnetic flux
    • Magnetic flux density
    • Induced current
    • Induced e.m.f.

  10. The flux linkage through a coil increases linearly from zero to 0.80 Wb in 2.0 s. What is the e.m.f. during this time?

    • 2.0 V
    • 0.80 V
    • 0.20 V
    • 0.40 V

  11. What quantity is represented by the area under an e.m.f. against time graph?

    • Total electrical energy
    • Peak current
    • Magnetic flux density
    • Flux linkage change

  12. A 60-turn coil has an induced e.m.f. of 3.0 V for 0.50 s. What is the change in flux through each turn?

    • 0.025 Wb
    • 0.25 Wb
    • 0.0025 Wb
    • 0.10 Wb

  13. When a magnet's south pole approaches a coil, what pole is induced on the nearest face?

    • North pole
    • South pole
    • Neutral pole
    • Alternating pole

  14. A loop leaves a magnetic field so flux decreases. What field direction does induced current produce?

    • Perpendicular direction
    • Same direction
    • Zero field
    • Opposite direction

  15. A 50-turn coil of area 0.20 m^2 turns from perpendicular to parallel to a uniform field of 0.40 T in 0.10 s. What is the average induced e.m.f.?

    • 4.0 V
    • 80 V
    • 40 V
    • 8.0 V

  16. In electromagnetic induction, mechanical work done against opposing forces is converted into which energy form?

    • Nuclear energy
    • Elastic energy
    • Gravitational energy
    • Electrical energy

  17. A flux linkage changes from 0.50 Wb to 0.20 Wb uniformly over 0.10 s. What is the magnitude of the induced e.m.f.?

    • 0.70 V
    • 7.0 V
    • 3.0 V
    • 0.30 V

  18. What property of the induced e.m.f. does the minus sign in Faraday's law determine?

    • Direction
    • Magnitude
    • Frequency
    • Peak value

  19. What is the induced e.m.f. in a coil experiencing a constant magnetic flux linkage?

    • Zero
    • Maximum
    • Proportional to current
    • Equal to voltage

  20. A 200-turn coil has the flux through each turn changing at a steady rate of 0.005 Wb s^-1. What is the magnitude of the induced e.m.f.?

    • 0.025 V
    • 1.0 V
    • 0.20 V
    • 40 V

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