A thin metallic spherical shell carries a charge Q on it. A point charge `Q_(1)` is placed at the centre of the shell and another charge q is placed outside as shown in figure ahead. All the charges are positive . Discuss the various forces acting on `Q_(1)`.

Explanation

Here the net force on `Q_(1)` will be zero because the net electric field inside a conductor due to charges on it and outside is zero. The force applied by q on `Q_(1)` will have the value `(Q_(1)q)/(4pi epsilon_(0)R^(2))` towards left . Equal and oppositive force will be applied by the charge Q on the shell to make not force on `Q_(1) = 0` . Shell will do this by rearranging its charge as shown below.