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Q.

A coil of 40 henry inductance 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 :

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a

15 seconds

b

40 seconds

c

20 seconds

d

5 seconds

answer is D.

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Detailed Solution

Time constant = LR=408=5 s

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A coil of 40 henry inductance 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 :