(1 point) A 5 mH inductor, a 25 μF capacitor, and a 20 Ω resistor are in series with a voltage source vs(t). The voltage source is zero prior to t=0. At t=0, it jumps to 75 V. At t=1 ms, it drops to zero. At t=2 ms it again jumps to 75 V, and it continues in the same periodic fashion. Find the current the source supplies at:

(a) t=0−

(b) t=0+

(c) t=1 ms

(d) t=2 ms

I was able to figure out a, b, and c. I don't know what to do to get (d).