"For the circuit shown below 0 = 20V, L = 4.0 mH; and R = 5.09_ After steady state current is reached with switch S1 closed and switch Sz open, Sz is closed at the same time S1 is opened (time t = 0). Determine the following:
(a) the current through L at [ = 0. (b) the current through L at (=40 * 10-' (c) the voltages across L and R at t =40 * 10-4s."