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Q.

In an L-R circuit connected to a battery of constant emf E, switch is closed at time t = 0. If e denotes the induced emf across the inductor and i the current in the circuit at any time t. Then the graph shows the correct variation of ‘e’ with ‘i’ is

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a

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b

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c

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d

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answer is A.

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Detailed Solution

$e = L \frac{d i}{d t} = E e^{- \frac{R}{L} t} e = E - i R$

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