CBSE Class 12-science Answered

Consider two concentric conducting spheres A and b of radii ‘R’ and ‘r’ ,respectively.

Such that:   R>r

Let charge on A sphere be ‘Q’ and B sphere be ‘q’.

Sphere A is hollow and B is solid.

Thus, potential on the surface of sphere A and B are:

Now.

Since,

1/r>1/R

Clearly V(r)>V(R)

Hence the potential on smaller sphere will always be greater than the larger sphere and since charge is always transferred from higher to lower potential, charge will always be transferred from smaller sphere to larger sphere irrespective of charge on those two spheres.