A charge Q is distributed over three concentric spherical shells of radii a, b, c (a`lt` b `lt` c) such that their surface charge densities are equal to one another.
The total potential at a point at distance r from their common centre, where r `lt` a, would be :

A charge 2Q is distributed over three concentric non-conducting spherical shells of radii a, b, c (a < b < c) such that their surface charge densities are equal to one another. The total potential at a point at distance r from their common centre, where r < a , would be:

A charge Q is distributed over two concentric hollow spheres of radii r and R (gt r) such that the surface charge densities are equal. Find the potential at the common centre.

A charge Q is distributed over two concentric hollow spheres of radii r and R (gt r) such that the surface charge densities are equal. Find the potential at the common centre.

A charge Q is distributed over two concentric hollow spheres of radii r and R (gt r) such that the surface charge densities are equal. Find the potential at the common centre.

A charge Q is distributed over two concentric hollow spheres of radii r and R (gt r) such that the surface charge densities are equal. Find the potential at the common centre.

A charge Q is distributed over two concentric hollow spheres of radii r and R (gt r) such that the surface charge densities are equal. Find the potential at the common centre.

A charge q is distributed over two concentric hollow sphere of radii a and b(bgtc) such that the surface densities are equal.Find the potential at the common centre.is