Question: A square in the xy plane in free space has a point charge of + Q at corner (a/2, a/2) and the same at corner

A square in the x–y plane in free space has a point charge of + Q at corner (a/2, a/2) and the same at corner (a/2, a/2) and a point charge of – Q at each of the other two corners.
(a) Find the electric potential at any point P along the x-axis.
(b) Evaluate V at x = a/2.

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