The nucleus of a copper atom contains 29 protons and has a radius of 4.8*10^-15m.

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The nucleus of a copper atom contains 29 protons and has a radius of 4.8*10^-15m. How much work (in electron volts) is done by the electric force as a proton is brought from infinity, where it is at rest, to the “surface” of a copper nucleus?

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