If the charge on the capacitor is increased by $2 \mathrm{C}$. The energy stored in it increase by $21 \%$. Total original charge on the capacitor is

Question

Aicharya · Accepted Answer

$\begin{aligned} & U=\frac{q^2}{2 \mathrm{C}} \ & 1.21 U=\frac{(q+2)^2}{2 \mathrm{C}} \end{aligned}$ By solving them, $q=20 \mathrm{C}$

If the charge on the capacitor is increased by $2 \mathrm{C}$. The energy stored in it increase by $21 \%$.…