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Question

The circuit shows a RLC circuit energized by a dc source of emf E. At t =0 the source is switched on

A
at t =0; current through the source is 2E3R
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B
at t= ; current through the source is 2E3R
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C
at t =0; current through the source is 2ER
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D
at t =0; current through the source is E2R
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Solution

The correct options are
A at t =0; current through the source is 2E3R
B at t= ; current through the source is 2E3R
at t =0; replace capacitors with short ckt and inductors open ckt and at t=, replace capacitor with open ckt and inductor with short ckt.
By doing that the circuit will be simplified which will result in a current of 2E3R at t = 0 and at t = both.

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