Question: A certain atom has 90 protons. Assume that the nucleus is a sphere with radius 7.34 fm and with the charge of the protons uniformly

A certain atom has 90 protons. Assume that the nucleus is a sphere with radius 7.34 fm and with the charge of the protons uniformly spread through the sphere. At the nucleus surface what are (a) the magnitude and (b) direction (radially inward or outward) of the electric field produced by the protons?

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