Answer to Question #280035 in Electricity and Magnetism for Niel

Question

Consider a series circuit including a 4Ω, a 16mH-inductor, and a power supply of 9 volts.

Find the current in the circuit 100μs after the switch is closed?

Answer 1

$$I=\frac VR(1-e^{-Rt/L})=0.056\text{ A}.$$