A source of sound emits 200`piW` power which is uniformly distributed over a sphere of radius 10 m. What is the loudness of sound on the surface of the sphere?

A charge Q coulomb is uniformly distributed over a sphere volume of radius R metres. What will be the expression for the energy of the system.

A charge Q coulomb is uniformly distributed over a sphere volume of radius R metres. Obtain an expression for the energy of the system.

Assuming that the charge on an atom is distributed uniformly is a sphere of radius 10^(-10) m, what will be the electric field at the surface of the gold atom ? For gold, Z=79.

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