The circuit of Figure 736 has C =0:25 F and L= 1 H. The switch has been

The circuit of Figure 7–36 has C =0:25 μF and L= 1 H. The switch has been open for a long time and is closed at t = 0. Find the capacitor voltage for t ≥ 0 for ðaÞ R= 8:5 kΩ,

ðbÞ R= 4 kΩ, and ðcÞ R= 1 kΩ. The initial conditions are I0 = 0 and V0 = 15 V.

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t=0 Li(0)=0 C + + R vc(t): 15 V FIGURE 7-36