GP Magnetism

Commercial electric motors do not use

  1. an electromagnet to rotate the armature
  2. effectively large number of turns of conducting wire in the current carrying coil
  3. a permanent magnet to rotate the armature
  4. a soft iron core on which the coil is wound

Answer

An electric motor is a device that converts electric energy into mechanical energy. An electric motor has an electromagnet in instead of permanent magnet (as permanent magnet does not produce strong magnetic field).

Large number of turns of the conducting wire in the current-carrying coil to produce stronger magnetic field. It also has a soft iron core on which the coil is wound also known as armature.

The correct option is C.