$A$ capacitor of capacity $50\,\mu F$ is charged to $10\;V$. Its energy is equal to:

If the charge on a capacitor is increased by $2 \ C$,the energy stored in it increases by $21 \%$. The original charge on the capacitor is (in $C$)

What is energy density? Write its formula.

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

$A$ parallel plate air capacitor has a uniform electric field $E$ in the space between the plates. The area of each plate is $A$ and the distance between the plates is $d$. The energy stored in the capacitor is $[\varepsilon_0 = \text{permittivity of free space}]$

Consider a parallel plate capacitor of area $A$ (of each plate) and separation $d$ between the plates. If $E$ is the electric field and $\varepsilon_0$ is the permittivity of free space between the plates,then the potential energy stored in the capacitor is $:-$