Lesson 6.3.1

6.3.1 Magnetic fields Quiz: OCR Physics, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.3.1, Magnetic fields: 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 causes magnetic fields at a fundamental level in matter?

    • Moving electric charges
    • Thermal vibrations
    • Stationary mass
    • Static electric charges

  2. What SI unit is used to measure magnetic flux density?

    • Henry
    • Weber
    • Gauss
    • Tesla

  3. In Fleming's left-hand rule, what does the thumb represent?

    • Electric current
    • Particle velocity
    • Magnetic field
    • Direction of force

  4. In Fleming's left-hand rule, what does the first finger represent?

    • Electric charge
    • Magnetic field
    • Electric current
    • Motion direction

  5. In Fleming's left-hand rule, what does the second finger represent?

    • Magnetic force
    • Magnetic field
    • Electric current
    • Resistance

  6. In the equation F = BIL sin θ, what is θ?

    • Phase angle
    • Angle to current
    • Refractive index
    • Angle to field

  7. At what angle to a magnetic field does a wire experience maximum force?

    • 45 degrees
    • 90 degrees
    • 180 degrees
    • 0 degrees

  8. When is the magnetic force on a current-carrying wire equal to zero?

    • At 45 degrees
    • Perpendicular to field
    • Parallel to field
    • At 60 degrees

  9. In a digital balance experiment, what law explains the measured upward force?

    • Newton's third law
    • Faraday's law
    • Hooke's law
    • Lenz's law

  10. A 0.2 m wire carrying 3 A is perpendicular to 0.5 T. What force acts on it?

    • 0.3 N
    • 1.5 N
    • 0.03 N
    • 3.0 N

  11. One Tesla is defined as one Newton per what unit combination?

    • Joule-ampere
    • Ampere-metre
    • Volt-second
    • Coulomb-metre

  12. What is the nature of the magnetic field inside a long solenoid?

    • Diverging radial
    • Zero field
    • Circular loops
    • Uniform and parallel

  13. Which rule gives the magnetic field direction around a straight wire?

    • Fleming's right-hand rule
    • Lenz's law
    • Fleming's left-hand rule
    • Right-hand grip rule

  14. What is the SI unit used for measuring magnetic flux?

    • Henry
    • Weber
    • Farad
    • Tesla

  15. A coil of area 0.04 m² is perpendicular to a 0.2 T field. Calculate flux.

    • 0.005 Wb
    • 0.008 Wb
    • 5 Wb
    • 0.08 Wb

  16. What is the expression for magnetic flux linkage in an N-turn coil?

    • Flux / N
    • N / Flux
    • N² x Flux
    • N x Flux

  17. Which equation gives the magnetic force on a charged particle moving perpendicular to a field?

    • F = EQ
    • F = BIL
    • F = BQv
    • F = B / Qv

  18. What path does a charged particle take when entering a magnetic field perpendicularly?

    • Circular
    • Helical
    • Straight line
    • Parabolic

  19. In a velocity selector, what speed of particle passes through completely undeflected?

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

  20. Why are transformer iron cores laminated with thin insulated layers?

    • Reduce eddy currents
    • Eliminate hysteresis loss
    • Prevent thermal expansion
    • Increase magnetic flux

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