After the current in the circuit of Fig. P30.63 has reached its final, steady value with switch S1 closed and S2 open, switch S2 is closed, thus short-circuiting the inductor. (Switch S1 remains closed. See Problem 30.63 for numerical values of the circuit elements.) (a) Just after S2 is closed, what are ʋac and ʋcb, and what are the currents through R0, R, and S2? (b) A long time after S2 is closed, what are ʋac and ʋcb, and what are the currents through R0, R, and S2? (c) Derive expressions for the currents through R0, R, and S2 as functions of the time t that has elapsed since S2 was closed. Your results should agree with part (a) when t = 0 and with part (b) when t → ∞. Graph these three currents versus time.
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