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Four equal charges Q are placed at the four corners of a square of each side is ‘a’. Work done in removing a charge – Q from its centre to infinity is

(1) 0

(2) $\frac{\sqrt{2}{Q}^{2}}{4\pi {\epsilon }_{0}a}$

(3) $\frac{\sqrt{2}{Q}^{2}}{\pi {\epsilon }_{0}a}$

(4) $\frac{{Q}^{2}}{2\pi {\epsilon }_{0}a}$

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