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Question

A coil of inductance 40 henry is connected in series with a resistance of 8 ohm and the combination is joined to the terminals of a 2 volt battery. The time constant of the circuit is

A
40 seconds
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B
20 seconds
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C
8 seconds
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D
5 seconds
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Solution

The correct option is D 5 seconds
τ=LR=408=5 sec

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