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Consider two solid dielectric spheres of...

Consider two solid dielectric spheres of radius a, separated by a distance `R(R gt gt a)`. One of the spheres has a charge q, and the other is neutral (see figure). We double the distance between two sphere. How much charge should reside on the first sphere now so that the force between the spheres remains the same ?

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The correct Answer is:
`q'=4sqrt(2)q`
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