Coulomb’s force law
Coulomb’s law is formulated for point-like charged objects. Imagine that you have two point-like charged objects q1 and q2 of unspecified sign separated by a distance d and you also have two large spheres of radius R with the same charges q1 and q2. The distance between the centers of the spheres is d. Compare the electric force that the point-like objects exert on each other to the force that the two spheres exert on each other. Consider all possibilities.
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