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 2E3Rat 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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