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Q.

An alternating current passes through a coil. When current in coil decreases from maximum to zero, then

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a

Energy is being returned to source

b

Energy is neither absorbed (or) returned

c

Energy is absorbed from source

d

Energy is continuously absorbed and returned to source.

answer is B.

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Detailed Solution

Whenever current in a coil decreases, a back emf induces in such a way that it induces a current in the direction of existing current, to oppose the decrease in it. In this way coil transfers energy to the source.

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