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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. 10.2 Y if + 25.0 v (1=0 40 mH - 10V + - 500 FIGURE 8.55 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. 21 K0 t o 82 kn + 20 V y 12 mF - FIGURE 8.61

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Electrical Engineering Questions
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