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Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the...

Two small spheres spaced 20.0 centimeters apart have equal charge. How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is 4.57*10^-21 newtons
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Solution Q=Q' Hence force is Number of electron is e=1.6*10^-19 C Hence 891 electron on each to have repulsive force

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