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  1. VR at t < T, t = ∞

    2. A.
    500e-40x104t, 0
    B.
    100e-40x103t, 0
    C.
    100e-40x106t, 0
    D.
    100e-40x104t, 0

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    Answer : Option D

    Explanation :

    At t = 0, C1, C2, C3 acts as short.

    ∴ entire voltage will appear cross R.

    At t increases the voltage across the resistance decrease exponentially.

    T = RCnet = 10 x 2.5 x 10-6 = 25 μ sec

    Initial voltage

    VR = V0e-t/RC at t = 0 = 100

    = 100 e-t/25x10-6 V.

    VR = 100 e-40x104t V.

    At t = ∞, VR = 0

    The charge C0 will be distributed in C1, C2, C3 and no current will flow.

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