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Question

The force of repulsion between two point charges is F, when these are at a distance of 1 m apart. Now they are replaced by conducting spheres each of radii 25 cm having the same charge as that of point charges. The distance between their centres is 1 m, then compare the force of repulsion in the two cases.

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Solution

For point charges F=kq1q2r2=kq1q2 , since r=1m
Since charge on conducting sphere is assumed to be placed at the center of the sphere, hence repulsive force on both sphere is also given by, F=kq1q2 , hence force on both sphere will be same as the repulsive force on the both point charges. It does not depend on the radius of the sphere.

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