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Each corner of a square of side ‘a’ m has charge +q each on opposite corners of a diagonal and ‘–q’ each on the opposite corners of the other diagonal. Calculate the potential energy of the system.

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$ \large\frac{q^2}{4 \pi \in_0 a} $$(\sqrt 2- 4)$
Hence A is the correct answer.
answered Jun 11, 2014 by meena.p

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