Determine whether the circuit in Figure P4.70 is overdamped or underdamped for $t>0$. Assume $V_S=15 \mathrm{~V}, R=200 \Omega, L=20 \mathrm{mH}$, and $C=0.1 \mu \mathrm{~F}$. Determine the capacitance that results in critical damping.
(FIGURE CAN'T COPY)
Figure P4.70