Q.

A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach e−1e≈63.2% of its final value

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a

1 second

b

2 seconds

c

e seconds

d

2e seconds

answer is B.

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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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