The switch in Figure P7–57 has been in position B for a long time and is moved to position A at t ¼ 0. The circuit parameters are R1 ¼ 500 V, R2 ¼ 500 V, L ¼ 250 mH, C ¼

1 mF, and VA ¼ 5V.

(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.