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2. The nucleus in an iron atom has a radius of about 4.0×10-15 m and contains 26 protons.
(i) What is the magnitude of the repulsive electrostatic force between two of the protons that
are separated by 4.0×10-15 m? (b) What is the magnitude of the gravitational force between
those same two protons? [Given, e = +1.6x10-19 C and mp=1.67x1027 kg]
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