S₁ R₁ www 0000 R2

For the circuit shown below, E = 20 V, L = 4.0 mH, and R_1 = R_2 = 5.0 Ω. After steady
state is reached with S1 closed and S2 open, S2 is closed while simultaneously opening S1 (at
t = 0). Determine
a. the current through the inductor at t = 0. 
b. the current through the inductor at t = 4.0 × 10^-4 s. 
c. the voltages across the inductor and resistor R_2 at t = 4.0 × 10^-4 s.