O-LevelPhysicsMagnetism5054/11 · May/June 2019 · Q361 Mark
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?
Aincreasing the number of turns in the coil
Breversing the current
Cusing a lower voltage supply
Dusing a stronger magnet
✓ Correct answer
C: using a lower voltage supply
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