9. The switch in the circuit of Fig. 8.55 has been closed a ridiculously long time
before suddenly being thrown open at t = 0. (a) Obtain expressions for is and v
in the circuit of Fig. 8.55 which are valid for all t > 0. (b) Calculate in(t) and
v(t) at the instant just prior to the switch opening, at the instant just after the
switch opening, and at t = 470 us.
23. For the circuit represented schematically in Fig. 8.61, (a) calculate v(t) at
t = o, t = 984 s, and t = 1236 s; (b) determine the energy still stored in the
capacitor at t = 100 s.
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