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  1. In the circuit s closed for a long time and steady state is reached. s is opened at t = 0+ Determine current through resistor.

    2. A.
    A
    B.
    A
    C.
    - A
    D.
    - A

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    Answer : Option B

    Explanation :

    Steady state with s closed.

    C is open Is = 4.

    This source current is divided between two resistors Ω and 1 Ω.

    Across 1 Ω, C is open, I in 1 Ω is = 1 A.

    Hence voltage across C is 1 V. The initial charge on C is V0 = 1 V.

    At t = 0+, s is opened bringing R = 1 Ω into the circuit.

    C is replaced by 1 V source with positive polarity left.

    The circuit has two sources Is = 4 and V0 = 1.

    The currents in the resistor R = and R = 1 can be determined by superposition.

    For R =

    Due to Is only (short V0)

    I = Is x= 3

    Due to V0 only (open Is)

    I == Downwards

    Adding, current through R = is 3= .

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