Find the current i at time t =

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Direction: Fig. shows the statement for given question.

Find the current i at time t = – 2 sec—

1. 2 amp.
2. – 2 amp
3. 1 amp
4. None of these

Correct Option: A

At t = – 2 sec
source 30 u (t + 1) → does not exist and equal to 0 V 2 u (1 – t) → exist, and equal to 2 amp the equivalent circuit becomes

Now, apply superposition theorem, we conclude that only 20 V source is responsible for current I.

So, I =	20	= 2 amp
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