A condenser of capacity $50\,\mu F$ is charged to $10\;volts$. Its energy is equal to
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(a) $U = \frac{1}{2}C{V^2} = \frac{1}{2} \times 50 \times {10^{ - 6}} \times {(10)^2} = 2.5 \times {10^{ - 3}}J$
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