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If identical charges (–q) are placed at each corner of a cube of side b, then electric potential energy of charge (+q) which is placed at centre of the cube will be

(1) $\frac{8\sqrt{2}{q}^{2}}{4\pi {\epsilon }_{0}b}$

(2) $\frac{-8\sqrt{2}{q}^{2}}{\pi {\epsilon }_{0}b}$

(3) $\frac{-4\sqrt{2}{q}^{2}}{\pi {\epsilon }_{0}b}$

(4) $\frac{-4{q}^{2}}{\sqrt{3}\pi {\epsilon }_{0}b}$