A condenser has a capacity $2\,\mu \,F$ and is charged to a voltage of $50\, V$. The energy stored is
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(d) $U = \frac{1}{2}C{V^2} = \frac{1}{2} \times 2 \times {10^{ - 6}} \times {(50)^2} = 25 \times {10^{ - 4}}\,J$
$ = 25 \times {10^3}\,erg$
$ = 25 \times {10^3}\,erg$
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