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Question

A solenoid has an inductance of 60 H and a resistance of 30 Ω. If it is connected to a 100 V battery, how long will it take for the current to reach 63.2% of its steady state value?

A
1 s
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B
2 s
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C
3 s
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D
4 s
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Solution

The correct option is B 2 s
The time taken by the current to reach to 63.2% of its steady state value in an RL circuit, is equal to its time constant.

t=τ=LR=6030=2 s

Hence, (B) is the correct option.

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