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$$\begin{aligned}(A C)^{2} &=(B D)^{2}=(\sqrt{2})^{2}+(\sqrt{2})^{2} \\

(A C)^{2} &=(B D)^{2}=2+2 \\ (A C) &=(B D)=\sqrt{4} \\ (A C) &=(B D)=2 \\A O &=B O=C O=D O=\dfrac{A C}{2} \\A O &=B O=C O=D O=1m, \dfrac{1}{4 \pi \varepsilon_0}=k\end{aligned}$$

Potential at the centre of square

$V_{0}=AOkq_{1} +BOkq_{2} +COkq_{3} +DOkq_{4} V_{0}=1k [100−50+20−60]×10_{−6}V_{0}=9×10_{9}[10×10_{−6}C]V_{0}=9×10_{9}×10×10_{−6}voltV_{0}=9×10_{4}volt $

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