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

a permanent magnet to rotate the armature

Explanation - 

An electric motor is a device that converts electric energy into mechanical energy.

An electric motor has an electromagnet instead of a permanent magnet (as a permanent magnet does not produce a strong magnetic field).

A large number of turns of the conducting wire in the current-carrying coil produce a stronger magnetic field.

It also has a soft iron core on which the coil is wound also known as an armature.