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(a) In a d.c. motor, why must the current to the coil be reversed twice during each rotation ? (b) What device reverses the current ?

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(a) In a d.c. motor, why must the current to the coil be reversed twice during each rotation ?

(b) What device reverses the current ?
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(a) The current to the coil must be reversed twice during each rotation so that the coil keeps rotating continuously in the same direction. 

(b) Commutator.

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