Question

what happens when you reverse polarity in a motor?
a) the motor speed increases
b) the motor speed decreases
c) the motor changes directions
d) the motor becomes a generator

Explanation:

In an electric - motor, the direction of rotation is determined by the interaction between the magnetic fields. Reversing the polarity of the power supply changes the direction of the current in the windings, which in turn changes the magnetic - field orientation. According to the principle of electromagnetic induction and the Lorentz force, this results in a change of the direction in which the motor rotates.

Answer:

C) The motor changes directions