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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
Solution
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.
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