[" A spherical balloon of radius "R" charged uniformly on its surface with surface density "sigma" .Find work done "],[" against electric forces in expanding it upto radius "2R" ."]

A sperical ballon od radius R charged uniformly on its surface with surface density sigma . Find work done against electric forces in expanding it upto radius 2R.

A sperical ballon od radius R charged uniformly on its surface with surface density sigma . Find work done against electric forces in expanding it upto radius 2R.

A sperical ballon od radius R charged uniformly on its surface with surface density sigma . Find work done against electric forces in expanding it upto radius 2R.

A spherical shell of radius R_(1) with uniform charge q is expanded to a radius R_(2) . Find the work performed by the electric forces in this process.

A spherical shell of radius R_(1) with uniform charge q is expanded to a radius R_(2) . Find the work performed by the electric forces in this process.

A spherical shell of radius R is uniformly charged to a surface charge density sigma . Br State the theorem which can be used to find the electric field outside the shell.

A spherical shell of radius b with charge Q is expanded to a radius a. Find the work done by the electrical forces in the process.

A flat disc of radius R charged uniformly on its surface at a surface charge density sigma . About its central axis of rotation it rotates at an angular speed omega . Find the magnetic moment of disc due to rotation of charges.

A spherical shell is uniformly charged with the surface density sigma . Using the energy conservation law, find the magnitude of the electric force acting on a unit area of the shell.