Question

Commercial electric motors do not use ____________.

Options

• an electromagnet to rotate the armature

• effectively large number of turns of conducting wire in the current-carrying coil

• a permanent magnet to rotate the armature

• a soft iron core on which the coil is wound

Answer 1

Commercial electric motors do not use a permanent magnet to rotate the armature.

Explanation:

The magnetic field strength of an electromagnet is increased by raising the current. As a result, the electric power will be increased.