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In the circuit shown in figure switch S ...

In the circuit shown in figure switch S is closed at time t=0. The charge which passes through the battery in one time constant is

A

`(eR^(2)E)/(L)`

B

`E(L/R)`

C

`(EL)/(eR^(2))`

D

`(eL)/(ER)`

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The correct Answer is:
A
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