A 12.6 V battery is in a circuit with a 30.0 mH inductor and a 0.150 resistor, as in Active Figure 20.27. The switch is closed at t = 0.
(a) Find the time constant of the circuit.
(b) Find the current after one time constant has elapsed.
(c) Find the voltage drops across the resistance when t = 0 and t = one time constant.
(d) What's the rate of change of the current after one time constant?