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In an LR circuit, current at t=0 is 20A ...

In an LR circuit, current at t=0 is 20A . After 2s it reduced to 18A. The time constant of the circuit is (in second)

A

In`(10/9)`

B

`2`

C

`2/("In"(10/9))`

D

`2 "In"(10/9)`

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The correct Answer is:
C
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