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E S Figure 31.2: RL Circuit (Problems 8 and 10) 10. In the circuit given in Fig. 31.2, R 20 kS2, R220 k2, L 50 mH, and the ideal battery has E40 V. The switch has been open for a (a) Just after the switch was closed, what are the current through the (b) After a very long time, what is the current through the battery (c) What is the current through the battery and its rate of change at Ans. 0 A 800 A/s; 1.8 mA and 440 A/s; 4.0 mA and 0 long time, then it is closed at time t = 0. battery and its rate of change? and its rate of change?

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