Lesson 6.7.2.3

6.7.2.3 Electric motors (HT only) Quiz: AQA Combined Science, Unit 24

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.7.2.3, Electric motors (HT only): 20 multiple choice questions for the AQA GCSE Combined Science (8464), Unit 24: Magnetism and electromagnetism, written with Revision Ninja.

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The 20 questions

  1. What happens when a coil of wire carrying a current is placed in a magnetic field?

    • It charges
    • It stretches
    • It melts
    • It rotates

  2. (HT only) Rotation of a current-carrying coil in a magnetic field is the basis of:

    • A permanent magnet
    • An electric motor
    • A compass
    • A transformer

  3. Why does a current-carrying coil rotate inside a magnetic field?

    • Zero resistance
    • Equal forces
    • Magnetic attraction
    • Opposite forces

  4. What causes the continuous rotation of a coil in an electric motor?

    • Frictional drag
    • Electrostatic repulsion
    • Turning effect
    • Gravitational pull

  5. What energy transfer does a simple electric motor perform?

    • Chemical to thermal
    • Kinetic to electrical
    • Thermal to light
    • Electrical to kinetic

  6. What happens to the magnetic force on a current-carrying coil placed in a stronger magnetic field?

    • Smaller force
    • Larger force
    • Unchanged force
    • Zero force

  7. (HT only) Increasing the current in a motor coil causes the turning force to:

    • Increase
    • Reverse
    • Decrease
    • Stay constant

  8. What effect is produced when a current-carrying conductor is placed in a magnetic field?

    • Heating effect
    • Motor effect
    • Generator effect
    • Chemical effect

  9. What fundamental principle causes an electric motor coil to spin?

    • The motor effect
    • Electromagnetic induction
    • Electrostatic repulsion
    • The generator effect

  10. (HT only) A motor coil side is 0.2 m long, in a 0.4 T field, carrying 3 A at right angles. The force on that side is:

    • 2.4 N
    • 0.24 N
    • 0.6 N
    • 0.024 N

  11. What is the net force on a coil when opposite sides experience equal and opposite forces?

    • Doubled force
    • Zero net force
    • Unbalanced force
    • Maximum force

  12. Which variable does not affect the magnetic force on a conductor in a motor?

    • Magnetic flux density
    • Wire colour
    • Wire length
    • Current

  13. How does increasing the number of turns on a motor coil affect the total force?

    • Smaller total force
    • Unchanged total force
    • Larger total force
    • Zero total force

  14. (HT only) A 0.5 m wire lies at right angles to a 0.2 T field and carries 1 A. The force is:

    • 0.1 N
    • 0.5 N
    • 1 N
    • 0.01 N

  15. What two factors determine the direction of rotation of a simple electric motor?

    • Voltage and resistance
    • Mass and weight
    • Length and speed
    • Current and field

  16. What happens to the coil of a simple electric motor when its current supply is switched off?

    • Stops rotating
    • Reverses direction
    • Melts instantly
    • Speeds up

  17. What scientific phenomenon causes a wire carrying a current in a magnetic field to move?

    • Generator effect
    • Motor effect
    • Magnetic saturation
    • Electromagnetic induction

  18. Why do opposite sides of a rectangular motor coil experience forces in opposite directions?

    • Resistance changes
    • Voltage alternates
    • Fields are different
    • Current flows oppositely

  19. At what orientation to the magnetic field is the turning effect on a coil greatest?

    • Right angles
    • Parallel
    • Diagonal
    • Zero degrees

  20. What happens to the turning effect as a motor coil rotates until its sides are parallel to the field?

    • Remains constant
    • Falls to zero
    • Increases to maximum
    • Reverses direction

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