Four capacitors are arranged as shown. All are initially uncharged. A $30 \mathrm{V}$ battery is placed across terminal $\mathrm{PQ}$ to charge the capacitors and is then removed. The voltage across the terminals $\mathrm{RS}$ is then $(\mathrm{in} \mathrm{volt})$

Charge $Q$ on a capacitor varies with voltage $V$ as shown in the figure, where $Q$ is taken along the $X$ -axis and $V$ along the $Y-\mathrm{axis}$. The area of triangle $OAB$ represents

In the circuit shown in figure $C=6 \mathrm{\mu F},$ The charge stored in the capacitor of capacity $C$ is

In the circuit shown in figure. Charge stored in $6 \mu \mathrm{F}$ capacitor will be

For a charged parallel plate capacitor shown in the figure, the force experienced by an $\alpha$ - particle will be

Two capacitors each having capacitance $C$ and breakdown voltage$V$ are joined in parallel. The capacitance and the breakdown voltage of the combination will be: