A metal sphere of radius 19 cm has a net charge of 7.0x10-8, Ask an Expert

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A metal sphere of radius 19 cm has a net charge of 7.0X10-8 C.

What is the electric field at the sphere's surface?
If V = 0 at infinity, what is the electric potential at the sphere's surface?
At what distance from the sphere's surface has the electric potential decreased by 700 V?

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