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A coil has an inductance of 2.5 H and a ...

A coil has an inductance of `2.5 H` and a resistance of `0.5r`. If the coil is suddenly connected across a `6.0` volt battery, then the time required for the current to rise `0.63` of its final value is

A

`3.5` sec

B

`4.0` sec

C

`4.5` sec

D

`5.0` sec

Text Solution

Verified by Experts

The correct Answer is:
D
`t=tau=(L)/(R )=(2.5)/(0.5)=5`sec
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