At $t<0$, the circuit shown in Figure P5.36 is at steady state and the voltage across the capacitor is +7 V . The switch is changed as shown at $t=0$ and:
$$
\begin{array}{ll}
V_S=12 \mathrm{~V} & C=3300 \mu \mathrm{~F} \\
R_1=9.1 \mathrm{k} \Omega & R_2=4.3 \mathrm{k} \Omega \\
R_1=4.3 \mathrm{k} \Omega & L=16 \mathrm{mH}
\end{array}
$$
Determine the initial voltage across $R_2$ just after the switch is changed.