7–31 Switches 1 and 2 in Figure P7–31 have both been in position A for a long time. Switch 1 is moved to position B at t =0 and Switch 2 is moved to position B at t = 20 ms. Find the voltage across the 0:22-μF capacitor for t ≥ 0 and sketch its waveform.

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SW#1 150 Bo 1=0 120 V SW#2 50 W + 0.22 F: VC(1) BQ=0.02 FIGURE P7-31