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Also see Boas (Math Methods) Ch. 12 sect.5 ex. 1 for future reference. Solution if You have 2 +ve charges Q at +/- "a" on y-axis and 2 -ve charges Q at +/- "a" on x-axis is V=\frac{-3Qa^{2}cos(2\theta)}{4\pi\epsilon_{0}r^{3}}