The nucleus of a promethium-145 atomcontains 61 protons, Ask an Expert

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The nucleus of a promethium-145 atomcontains 61 protons. Assume that thenucleus is a sphere with radius 5.69fm and with the charge of the protons uniformly spread through thesphere. At the nucleus surface, what are the magnitude and direction of the electric field produced by the protons?

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