In the circuit shown in Fig. there are two parallel plate capacitors each of capacitance $\mathrm{C} .$ The switch $S_1$ is pressed first to fully charge the capacitor ${\mathrm{C}}_1$ and then released. The switch ${\mathrm{S}}_2$ is then pressed to charge the capacitor ${\mathrm{C}}_2.$ After sometime, ${\mathrm{S}}_2$ is released and then ${\mathrm{S}}_3$ is pressed. After some time