An air filled parallel plate capacitor having circular plates of diameter $D$ is given a charge $Q.$ The magnitude of the force acting between plates is $\frac{n{Q}^2}{\pi {\epsilon }_0{D}^2}.$ The value of $n$ is

The potential of point $P$ is $n \mathrm{V}.$ The value of$n$ is

In the arrangement shown, the battery is disconnected and a dielectric slab of dielectric constant $K$ is inserted between the plates of capacitor with capacitance $C$, so as to completely fill the space. The final potential difference across capacitor with capacitance $2C$ is $\frac{nV}{K+2}.$ The value of $n$ is

A $2 \mu \mathrm{F}$ capacitor is charged as shown in the figure. The percentage of its stored energy dissipated after the switch $S$ is turned to position $2$ is $n.$ The value of $n$ is

In the given circuit, a charge of $+80 \mu \mathrm{C}$ is given to the upper plate of the $4 \mu \mathrm{F}$ capacitor. Then in the steady state, the charge (in $\mu \mathrm{C}$ ) on the upper plate of the $3 \mu \mathrm{F}$ capacitor is