Edexcel IGCSE Physics 6.12 Motor Effect Applications Questions

A current in the motor coil interacts with the permanent magnet’s field to produce opposing forces. In a loudspeaker, alternating current reverses the force on the cone so it vibrates.

Exam points

Explain that a current-carrying motor coil creates a magnetic field that interacts with the permanent magnet’s field, producing opposite forces on the two sides of the coil and turning it.
Describe how brushes maintain electrical contact and the split-ring commutator reverses current in the coil every half-turn so the motor continues rotating in the same direction.
Explain how an alternating current reverses the force on a loudspeaker coil or cone, making the cone vibrate and the surrounding air produce sound.
Explain why parallel current-carrying wires attract by stating that each wire experiences a force in the magnetic field produced by the other.

[Maximum number: 2]

Diagram 1 shows some apparatus used to demonstrate the magnetic force on a current-carrying wire in a magnetic field.

Diagram 1

The wire has a mass of 6.5 g .

Explain how the circuit could be changed to make the wire vibrate.

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Edexcel IGCSE Physics 6.12 Motor Effect Applications Questions question 1