Lesson 6.3.3

6.3.3 Electromagnetism Quiz: OCR Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.3.3, Electromagnetism: 20 multiple choice questions for the OCR Physics (H156), Unit 5: Particles and medical physics, written with Revision Ninja.

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The 20 questions

  1. What is the SI unit of magnetic flux?

    • Gauss
    • Weber
    • Henry
    • Tesla

  2. Which equation defines magnetic flux through a surface of area A?

    • BA cos theta
    • BA sin theta
    • BA tan theta
    • B/A cos theta

  3. What is the equation for magnetic flux linkage in a coil?

    • N times flux
    • Flux / N
    • N / flux
    • N + flux

  4. Which law states induced e.m.f. equals the rate of change of flux linkage?

    • Faraday's law
    • Coulomb's law
    • Lenz's law
    • Ampere's law

  5. Which law accounts for the negative sign in Faraday's law equation?

    • Newton's law
    • Fleming's law
    • Lenz's law
    • Ohm's law

  6. Why are the iron cores in power transformers laminated?

    • Increase magnetic flux
    • Reduce copper resistance
    • Reduce eddy currents
    • Prevent core melting

  7. A transformer has 100 primary turns, 200 secondary turns, and 12 V input. What is V secondary?

    • 12 V
    • 48 V
    • 6 V
    • 24 V

  8. An ideal transformer steps down 240 V to 120 V. If primary current is 2 A, what is secondary current?

    • 4 A
    • 2 A
    • 1 A
    • 8 A

  9. What did the alpha-particle scattering experiment reveal about atomic structure?

    • Negatively charged core
    • Small dense nucleus
    • Indivisible solid sphere
    • Uniform positive charge

  10. Below what separation distance does the strong nuclear force become repulsive?

    • 1.0 nm
    • 0.5 pm
    • 3.0 fm
    • 0.5 fm

  11. What is the maximum range of the attractive strong nuclear force?

    • 33 fm
    • 3 fm
    • 3 pm
    • 3 nm

  12. Nuclear radius R depends on nucleon number A according to which relationship?

    • R proportional A^2
    • R proportional A^3
    • R proportional A
    • R proportional A^(1/3)

  13. How many neutrons are present in a nucleus of carbon-14 with proton number 6?

    • 6
    • 14
    • 20
    • 8

  14. How does the nuclear density of an atom change as its nucleon number increases?

    • Remains roughly constant
    • Quadruples with mass
    • Increases linearly
    • Decreases rapidly

  15. What is the magnetic flux through a 0.02 m^2 coil perpendicular to a 0.5 T magnetic field?

    • 0.01 Wb
    • 25 Wb
    • 0.02 Wb
    • 0.25 Wb

  16. A 50-turn coil experiences a magnetic flux change of 0.2 Wb in 0.1 s. What is the induced e.m.f.?

    • 100 V
    • 10 V
    • 2 V
    • 250 V

  17. What is the name of the antiparticle corresponding to the electron?

    • Positron
    • Antiproton
    • Photino
    • Neutrino

  18. What voltage output waveform is produced by a simple generator rotating at constant speed?

    • Constant direct voltage
    • Triangular voltage
    • Sinusoidal alternating voltage
    • Square wave voltage

  19. What is the approximate order of magnitude for the ratio of atomic radius to nuclear radius?

    • 10^15
    • 10^5
    • 10^2
    • 10^10

  20. What is the velocity v of undeflected charged particles in a velocity selector?

    • v = E B
    • v = E + B
    • v = E / B
    • v = B / E

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