A capacitor of capacitance $C$ has charge $Q$ and stored energy is $W$. If the charge is increased t

Question

A capacitor of capacitance $C$ has charge $Q$ and stored energy is $W$. If the charge is increased to $2 Q$, the stored energy will be

Professor PC Thomas Classes · Answer

Stored energy $W = \frac{Q^2}{2C}$. If charge $Q$ doubles to $2Q$, energy becomes $4W$.