Problem 2. The voltage waveform across a 5-mH inductor is shown below. Find and plot the
respective current waveform.
For $t \le -4$, $i_L(t) = 0$.
For $-4 \le t \le 0$, $i_L(t) = \frac{1}{L} \int_{-\infty}^{t} v(\tau) d\tau = \frac{1}{5 \cdot 10^{-3}} \int_{-\infty}^{t} 3 \, d\tau = 600(t + 4 \cdot 10^{-3})$
In particular, $i_L(0) = 2.4$ A.
For $t \ge 0$, $i_L(t) = i_L(0) = 2.4$ A