Problem V.
+ VL(t)
The switch in the circuit shown in Figure 5 has been
open for a long time before it closes at time t = 0.
Determine the values of VL(0-), the voltage across the
inductor immediately before the switch closes and
VL(0+), the voltage across the inductor immediately
after the switch closes.
18 mH
20 Ω
t = 0
Figure 5.
20 Ω
120 mA ↑