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The nucleus of an atom has a charge of 65 protons.

(a) What are the direction and magnitude of the electric field at 4.9 x 10^-10 m from the nucleus?

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Use Coulomb's law for the magnitude. The nuclear charge is +65 e, where e = 1.6*10^-19 Coulombs.

The direction is radially outward from the nucleus, everywhere.

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