Consider the circuit of Figure P4.28 in which the switch has been closed for a long time prior to t = 0. Determine the values of vC(t) before t = 0 and a long time after t = 0.Also, determine the time constant after the switch opens and expressions for vC(t). Sketch vC(t) to scale versus time for 0.2 ≤ t ≤ 0.5 s.
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