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Question

The switch in the circuit is closed at t=0. Find the current through the cell immediately after the switch is closed.


A
1 A
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B
2 A
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C
3 A
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D
4 A
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Solution

The correct option is B 2 A
At t=0 current in the circuit starts to grow and it has not reached steady state.
Immediately after the switch is closed, inductor will act as resistance & current will not enter the branch containing inductor.


circuit is effectively as shown, hence 2 Ω adjacent to inductor will be of no use.
i=VReq
i=6(1+2)=2 A

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