When the switch is closed, then initial current through 1 Ω resistor is (see figure)

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12 A

4 A

10/7 A

3 A

answer is B.

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Detailed Solution

Initially cement through the capacitor will be maximumSo 6 Ω and 3 Ω are in parallel total resistance6×39+1=3Ωi=123=4Ω

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