proton providing the centripetal force. According to Newton’s second law, F = mv2/r, where Fis the magnitude of the force, vis the speed of the proton, and ris the radius of its orbit, essentially the same as the radius of the sphere. The magnitude of the force on the proton is F = eq/4πε0r2, where qis the magnitude of the charge on the sphere. Thus, 22014eqmvrrε=πso ()()()()()227529092291.6710kg3.0010m/s0.0100 m41.0410C.8.9910
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