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Question

The current through the cell just after closing the switch S is :

71754.jpg

A
εR
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B
2εR
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C
ε3R
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D
ε2R
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Solution

The correct option is B ε2R
At t=0, inductor can be treated as open circuit and hence circuit becomes as shown. By parallel, series calculations, the equivalent resistance of the circuit becomes R' = 2R. So, I=ϵ2R
121859_71755_ans.jpg

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