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In an LR-circuit, time constant is that ...

In an `LR`-circuit, time constant is that time in which current grows from zero to the value (where `I_(0)` is the steady state current)

A

`0.63 I_(0)`

B

`0.50 I_(0)`

C

`0.37I_(0)`

D

`I_(0)`

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The correct Answer is:
A
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