Energy per unit volume for a capacitor having area A and separation d kept at potential difference V is given by

Question

${1 \over 2}{\varepsilon _0}{{{V^2}} \over {{d^2}}}$

${1 \over {2{\varepsilon _0}}}{{{V^2}} \over {{d^2}}}$

${1 \over 2}C{V^2}$

${{{Q^2}} \over {2C}}.$

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