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Consider two point charges Q and −Q×R/h (where R is a positive length, 0 < R...

Consider two point charges Q and −Q×R/h (where R is a positive length, 0 < R < h). Let point charge Q is on the positive z-axis at the point z = h and −Q × R/h is on the z-axis at the point z = R^2/h. Show that the surface of the sphere of radius R about the origin is an equipotential surface.

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