Current through the battery at the instance when the switch S is closed is: (see figure)
A
zero
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B
2 A
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C
4 A
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D
5 A
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Solution
The correct option is D 5 A When switch S is closed, at t=0 the capacitance at the top will behave as a short circuit. So the whole circuit will be treated as shown in figure below. Thus, the current through the battery is I=10/2=5A