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Question

An inductance L and a resistance R are first connected to a battery. After attaining steady state, the battery is disconnected but L and R remain connected in a closed circuit. Then, the current reduces to 37% of its initial value in time -

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Solution

The time taken by the current to decay from i0 to 37% of i0 is equal to the time constant given by,

τ=LR

Hence, option (C) is the correct answer.

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