In Fig. 30.11, suppose that and L = 0.160 H. With switch S2 open, switch S1 is left clo...

In Fig. 30.11, suppose that 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?