The switch in Figure P7–25 has been in position A for a long time and is moved to position B at t ¼ 0. The switch suddenly returns to positionAafter 10 ms. Find vC(t) for t 0 and sketch its waveform.

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100 V 1 + 20 w t=0 A? B + 1 F: vc(t) 80 - 20 FIGURE P7-25