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The work done in bringing a charge +q from infinity in free space, to a position at a distance d in front of a semiinfinite grounded metal surface is

The work done in bringing a charge +q from infinity in free space, to a position at a distance d in front of a semiinfinite grounded metal surface is Correct Answer $$ - \frac{{{q^2}}}{{4\pi {\varepsilon _0}\left( {4d} \right)}}$$

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