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In an L-R circuit connected to a battery...

In an L-R circuit connected to a battery of constant e.m.f. E switch S is closed at time t=0. If e denotes the magnitude of induced e.m.f. across inductor and i the current in the circuite at any time t. Then which of the following graphs shows the variation of e with `i`?

A

B

C

D

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A
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