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12 Magnetism and the motor effect

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Question 72
H

A simple motor coil has just passed the position where its turning effect is zero. Its split-ring commutator fails to reverse the current. Which explains why the motor will not continue to be driven in the same direction?

[1]
A

The magnetic poles have exchanged positions, so the current in the coil becomes larger.

B

The magnetic poles have exchanged positions, so the current in the coil becomes zero.

C

The sides have exchanged positions, so unchanged forces now oppose the rotation.

D

The sides have exchanged positions, so unchanged forces now increase the rotation.

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12 Magnetism and the motor effect Questions

  1. GCSE
  2. /Physics
  3. /12 Magnetism and the motor effect

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