Question: A solid sphere of radius R has a uniform charge density 7 and total charge Q. Derive an expression for its total electric potential energy.

A solid sphere of radius R has a uniform charge density 7 and total charge Q. Derive an expression for its total electric potential energy. (Suggestion: imagine that the sphere is constructed by adding successive layers of concentric shells of charge dq = (4/r 2 dr) 7 and use dU = V dq.)

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