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The current in a LR circuit builds up to...

The current in a LR circuit builds up to `3/4`th of its steady state value in 4s. The time constant of this circuit is

A

`(1)/(ln2) s`

B

`(2)/(ln2) s`

C

`(3)/(ln2) s`

D

`(4)/(ln2) s`

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