3. RL Circuit In the circuit shown, & = 100 V, R1 = 10 0, R2 = 20 0, R3 = 30 0, and the inductance L is 2.0 H. The switch has been open for a long time. S R1 R 3 13 12 R2 080 L (a) Find /1, 12, dl3/dt, and the voltage across the inductor VL immediately after switch S is closed. (b) Find I1, 12, dl3/dt, the voltage across the inductor, and the energy stored in the inductor a long time later. (c) A long, long time later, switch S is opened again. Find /1, 12, dl3/dt, the voltage across the inductor, and the energy stored in the inductor immediately after switch S is opened again