4. For the network shown in Fig.4: (a) Determine the mathematical expressions for the variation of the voltage across the capacitor following the closure of the switch at t = 0 on to position 1. (b) When the switch is closed on to position 2 at t = 100 ms, determine the new expression for the capacitor voltage. (c) Plot the voltage waveform for t = 0 to t = 200 ms.

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