Answer :

Given,


Electric force between the two spheres,


Distance between the two spheres,


We know that, magnitude of charge on electron,


Let n electrons be transferred from one sphere to another. Then, charge on one sphere is +ne and the other is -ne.



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Formula used:


By Coulomb’s law, the electric force is given by:



Where ϵ0 is the permittivity of free space


k is the electrostatic constant


q1 and q2 are the magnitude of charges


r is the distance of separation between the charges


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The magnitude of electric force is given by:







Hence, about electrons are transferred.


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