College Physics 10th Edition by Raymond Serway,Chris Vuille

Exercise 9

A battery is connected in series with a 0.30-V resistor and an inductor, as in Figure P20.43. The switch is closed at t = 0. The time constant of the circuit is 0.25 s, and the maximum current in the circuit is 8.0 A. Find (a) the emf of the battery, (b) the inductance of the circuit, (c) the current in the circuit after one time constant has elapsed, (d) the voltage across the resistor after one time constant has elapsed, and (e) the voltage across the inductor after one time constant has elapsed.