The energy required to charge a capacitor of $5\,\mu F$ by connecting a $d.c.$ source of $20\,kV$ is......$kJ$.

$A$ capacitor is charged by a battery and the energy stored in it is $U$. The battery is now removed and the separation distance between the plates is doubled. The energy stored now is:

If a capacitor of capacity $900 \mu F$ is charged to $100 \ V$ and its total energy is transferred to a capacitor of capacity $100 \mu F$, then its potential will be (in $V$)

When an additional charge of $2 \text{ C}$ is given to a capacitor,the energy stored in it increases by $21 \%$. The original charge of the capacitor is: (in $\text{ C}$)

$A$ capacitor of capacitance $6 \, \mu F$ is charged up to $100 \, V$. The energy stored in the capacitor is ........ $J$.

An uncharged capacitor is connected to a battery. While charging the capacitor,how much is the energy lost,from the energy supplied by the battery (in $\%$)?