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Consider four charges +q at the vertices of a square. From symmetry, the net force is zero. Now consider an additional charge
-q at the fourth vertex. From the principle of superposition this charge distribution is equivalent to the three charge configuration. Force=(1/4πk)((q^2)/(a^2/2))=(1/4πk)(2q^2)/a^2
F =( K x q2 ) √2 / a
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