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Question

Initially, the switch is in position 1 for a long time and then shifted to position 2 at t=0 as shown in figure. Just after closing switch, the magnitude of current through the capacitor is :

216017.PNG

A
zero
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B
E2R
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C
ER
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D
None of these
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Solution

The correct option is C ER
just before t=0
Switch Position 1
Steady state, hence io=ER
Switch Position 2
The presence of inductor does not let the current change instantaneously.
Ldidt+iCdtiR=0
So, at t=0, current in closed loop (confiding of capacitor) will remain same.

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