Question

Commercial electric motors do not use:
A. An electromagnet to rotate the armature.
B. Effectively a large number of turns of conducting wires used in the current carrying coil
C. A permanent magnet to crate the armature
D. A soft iron core on which the coil is wound.

Answer 1

Hint: An electric motor is defined as an electrical device that is used to convert electrical energy into mechanical energy. Most of the electric motors operate through the connection between the motor's magnetic field and electric current in a wire winding to produce a force in the form of torque which will act on the motor's shaft.

Complete step by step answer:
The principle of an electric motor is working on the basis of the magnetic field produced around the current carrying conductor. A current carrying conductor is placed perpendicular to the magnetic field so that it is felt by a force. The coil is made up of copper wire. It is because copper is such an excellent conductor. It is now wind on an armature coil. The coil will become an electromagnet when a current flows through it. The DC motor is used to be a readymade generator that will produce electricity. All that you have to do is to turn the Axle of the generator which is mechanical outside the source of energy. the electric motors will not use a permanent magnet to crate the armature. Instead they are using electromagnets.

So, the correct answer is “Option C”.

Note: Electric motors can be given power by direct current or DC sources, like from batteries, motor vehicles or rectifiers, or by the alternating current or AC sources, like power grid, inverters or electrical generators. An electric generator is physically similar to an electric motor, but the operation is in a reversed flow of power, by converting mechanical energy into electrical energy.