A very large sphere having charge `Q` uniformly distributed on the surface s compressed uniformly till its radius reduces to `R`. The work done by the electric force in this process is :

A long cylindrical shell of length l and radius a is given a uniformly distributed charge Q on its surface. If the shell is expanded uniformly to a radius b, find the work done by electrical forces in the process of expansion. [(lambda^(2)l)/(4pi in_(0))l n(b/a)]

A very small sphere having a charge q, uniformly distributed throughout its volume, is placed at the vertex of a cube of side a. The electric flux through the cube is

A very small sphere having a charge q, uniformly distributed throughout its volume, is placed at the vertex of a cube of side a. The electric flux through the cube is

There is a hemispherical shell having charge Q uniformly distributed on its surface. Radius of the shell is R. Find electric potential and field at the centre (of the sphere).

A charge Q is uniformly distributed over the surface of two conducting concentric spheres of radii R and r (Rgtr). Then, potential at common centre of these spheres is

A charge Q is uniformly distributed over the surface of two conducting concentric spheres of radii R and r (Rgtr). Then, potential at common centre of these spheres is

A hollow sphere has charge 'q' which is uniformly distributed over its surface and rotating about its axis .Find the magnetic moment of the sphere