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A solenoid has an inductance of 60 henry...

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-1)/(e)~=63.2%` of its final value

A

`1` second

B

`2` seconds

C

`e` seconds

D

`2e` seconds

Text Solution

Verified by Experts

The correct Answer is:
B
`t=tau=(L)/(R )=(60)/(30)=2`sec.
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