The switch in Figure P752 has been open for a long time and is closed at t 0. The circuit parameters are L

The switch in Figure P7–52 has been open for a long time and is closed at t ¼ 0. The circuit parameters are L ¼ 0.8 H, C ¼ 1.25 mF, R1 ¼ 2 kV, R2 ¼ 1 kV, and VA ¼ 12 V.

(a) Find vC(t) and iL(t) for t 0.

(b) Is the circuit overdamped, critically damped, or underdamped?

(c) Use OrCAD to simulate your results.

R1 R L ww t=0x 0=1 + VA w + iL(t) vc(t) C = FIGURE P7-52