GATE EC 2017 Set 2 — Question 31
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Network Theory → Transient & AC Analysis → RL, RC & RLC Transients
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Question
The switch in the circuit, shown in the figure, was open for a long time and is closed at .
The inductor in the right branch is H (in series with a resistor).The current (in ampere) at seconds is ___________
Correct answer
8 to 8.3
Solution
Before closing (): steady state, inductor is a short. The 10 A divides equally between the middle and the –inductor branch, so A (downward).After closing: the switch shorts the top node to the bottom node. The middle resistor carries no current, and the inductor discharges through its own resistor and the switch:KCL at the top node (source current in; switch current and inductor branch current out, both downward):At s: A.Answer: A
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