In the circuit shown in Fig. P30.61, ε= 60.0 V, R_1 = 40.0 Ω, R_2 = 25.0 Ω, and L = 0.300 H. (a) Switch S is closed. At some time t afterward, the current in the inductor is increasing at a rate of di/dt = 50.0 A/s. At this instant, what are the current i_1 through R_1 and the current i_2 through R_2? (Hint: Analyze two separate loops: one containing εand R_1 and the other containing ε, R_2, and L.) (b) After the switch has been closed a long time, it is opened again. Just after it is opened, what is the current through R_1?
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