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The energy stored in the condenser is

1. $QV$
2. $\frac{1}{2}QV$
3. $\frac{1}{2}C$
4. $\frac{1}{2}CQ$

Correct answer: $\frac{1}{2}QV$

Solution

The energy stored in a capacitor is $U=\frac{1}{2}CV^2$. Since $Q=CV$, this can also be written as $U=\frac{1}{2}QV$. Thus the correct option is $\frac{1}{2}QV$.

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