Answer :

Force if charges on each sphere is doubled and the distance is halved.


Q1 = 2 × q

Q2 = 2 × q

R = 0.5 × r

Using Coulomb’s law, we get,


Where, ε0 is the permittivity of the free space.

F = 0.243 N

The mutual force is 0.243N and it is repulsive in nature.

The new force is found to be 16 times the force in case I.

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