Question

Two identical metallic spheres
having charges + 4q and -2q are placed with
their centres 'r dis-tance apart. Force of
attraction between the spheres is F. If the
two spheres are brought in contact and then
placed at the same distance 'r apart, the
force between them:
​

Answer 1

Explanation:

answer is F/8.

I hope it may help you.

here negative sign indicates that the force is attractive .