The switch in the circuit shown below has been closed for a long time before it is opened at t = 0. Find the voltage v(t) across the capacitor for t ? 0. Assume R1 = 2.4 k?, R2 = 9 k?, R3 = 6 k?, R4 = 2 k?, Vs = 6 V, C = 0.5 ?F.


v(0) = V0 = Vs×= 3.6 V
Req = R3 + R4 = 8 k?
? = ReqC = 0.004 s
v(t) = 3.6 e-250t u(t)

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