Question

two identical spheres having charge 16 and -8 are kept certain distance apart then the force is F. they are touchedand again kept at same distance, the force becomes?

Answer 1

Initially, the force F =$k q_{1} q_{2} / r^{2}$ = k (16)(-8)/ $r^{2}$
When they are touched, the charge on each one of them becomes equal to $( q_{1} + q_{2} )/2$ = 4
Force = k(4)(4)/$r^{2}$ = -F/8