The energy stored in the condenser is
$QV$
$\frac{1}{2}QV$
$\frac{1}{2}C$
$\frac{1}{2}\frac{Q}{C}$
A capacitor of capacity $C$ has charge $Q$ and stored energy is $W$. If the charge is increased to $2Q$, the stored energy will be
A $12\,pF$ capacitor is connected to a $50\,V$ battery. How much electrostatic energy is stored in the capacitor
$27$ similar drops of mercury are maintained at $10 \,V$ each. All these spherical drops combine into a single big drop. The potential energy of the bigger drop is ....... times that of a smaller drop.
A parallel plate capacitor is charged to a certain potential and the charging battery is then disconnected. Now, if the plates of the capacitor are moved apart then:
A sphere of radius $1\,cm$ has potential of $8000\,V$, then energy density near its surface will be