The amount of counter-EMF produced in the armature is proportional to three factors: the number of turns of wire in the armature, the strength of the magnetic field of the pole pieces, and the speed of the armature.

Question

Quizplus · Accepted Answer

According to Faraday's law of electromagnetic induction, the magnitude of the induced EMF is proportional to the rate of change of magnetic flux. The rate of change of magnetic flux depends on the number of turns of wire in the armature, the strength of the magnetic field of the pole pieces and the speed of the armature. Therefore, the counter-EMF produced in the armature is proportional to these three factors.

The Amount of Counter-EMF Produced in the Armature Is Proportional