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Q.

Is it true a motor contains a kind of switch called a commutator which is reverse the current every rotation?


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a

True

b

False 

answer is A.

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Detailed Solution

 The above statement is True.
When the current flows through a circuit in the coil, there is a device that reverses the direction of the current, known as a commutator. When the magnetic field and current become perpendicular to each other, there is a change in current, twice in single rotations. This means that the half rotation coil moves in the opposite direction in the magnetic field after every half rotation.
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