題組內容

4. Consider the circuit shown in Fig. 1.

(b) Find \( i(t) \) if \( R = 2 \ \Omega \), \( L = 1 \ \text{H} \), \( C = 0.5 \ \text{F} \), and \( v_s(t) = \begin{cases} 1 \ \text{kV}, & 0 < t < 2 \\ 0, & 2 < t \end{cases} \). (10%)