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Q.

In an electric motor, to make the coil rotate continuously in the same direction, the current is reversed in the coil after every half rotation by a device called


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a

Carbon brush

b

Commutator

c

Slip ring

d

Armature 

answer is B.

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Detailed Solution

In an electric motor, to make the coil rotating continuously in the same direction, the current is reversed in the coil after every half rotation by a device called a commutator.
“The device that converts electrical energy to mechanical energy is called the electric motor”. It works on the principle of electromagnetic induction. “A device that reverses the direction of current in the arms of an armature through a circuit is called a commutator.” Thus, the device that reverses the direction of current in an electric motor is called the commutator.
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