In Fig. 30.11, suppose that ε = 60.0 V, R = 240 Ω, and L = 0.160 H. With switch S2 open, switch S1, is left closed until a constant current is established. Then S2 is closed and S1 opened, taking the battery out of the circuit. (a) What is the initial current in the resistor, just after S2 is closed and S1 is opened? (b) What is the current in the resistor at t = 4.00 × 10−4 s? (c) What is the potential difference between points b and c at t = 4.00 × 10−4 s? Which point is at a higher potential? (d) How long does it take the current to decrease to half its initial value?
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