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Physics · May / June 2019 · Paper 11 · Question 36

5054The d.c. motor

The coil of a simple motor lies between the poles of a permanent magnet. The coil rotates about its axis when there is a current in it. What decreases the frequency of rotation of the coil?

  1. Aincreasing the number of turns in the coil
  2. Breversing the current
  3. Cusing a lower voltage supply
  4. Dusing a stronger magnet

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Correct answer: C. using a lower voltage supply

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