Answer to Question #325388 in Electricity and Magnetism for ruzzel

Question #325388

Two small spheres spaced apart have equal charge. How many electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57 x 10^-21 N?

Expert's answer

"F=\\frac{kn^2e^2}{r^2},"

"n=\\sqrt \\frac Fk\\frac re=400."

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