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Question

In an LR 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 circuit at any time t. Then which of the following graphs shows the variation of e with i ?


Solution

The correct option is A
According to the Kirchoff's circuit law
Ldidt=EiR (straight line with - ve slope)
e=EiR
y=Rx+C
(e=Ldidt)

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