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A metal sphere of radius 13 cm has a net charge of 2.8 x10–8 C. (a) What is the electricfield at the sphere's surface? (b) If V =0 at infinity, what is the electric potential (in V) at thesphere's surface? (c) At what distance (in cm)from the sphere's surface has the electric potential decreased by690 V?
Only need answer for (c)

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