Calculate potential on the axis of a ring due to charge $\mathrm{Q}$ Uniformly distributed along the ring of radius $\mathrm{R}$.

 

In the circuit shown in Figure initially ${\mathrm{K}}_1$ is closed and ${\mathrm{K}}_2$ is open. What are the charges on each capacitors. Then ${\mathrm{K}}_1$ was opened and ${\mathrm{K}}_2$ was closed (order is important), What will be the charge on each capacitor now? $[\mathrm{C}=1\mathrm{\mu F}]$