Question

Two spherical conductors A and B having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor C having same radius as that of A but uncharged is bought in contact with B and then with A. then new force of repulsion between B and A will be :

Answer 1

As we know that \(F∝\frac{d^2}{q^2​}\)

When B is in contact with C; charge on B and C

\(\frac{q+0}{2} = \frac{q}{2}\)

When A is in contact with C; charge on A and C

\(\frac{q +\frac{q}{2}}{2} = \frac{3q}{4}\)