Question

A big hollow sphere a is charged 100 volt potential difference and another small hollow sphere is charged to 50 volt potential difference if b is put into a and joined with a metallic wire then the direction of the charge flow is

Answer 1

As the current flows from higher PD to lower PD the current will flow from B to A but at every point.

Answer 2

Answer:From B to A

Explanation:As the charge resides always on the outer surface therefore when both the spheres are connected by a wire,charge will flow essentially from inner to the outer surface whatever be the magnitude and sign of charge .

As soon as the sphere B is placed inside the sphere A ,if the potential of A becomes V then the potential of B becomes 50+V.

Since the potential of B is now higher than A,on connecting them through wire charge will flow from B to A.and this flow will continue untill the whole charge of B flows to A.