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.

When an uncharged conducting ball of radius R is placed in an external uniform electric field, a surface charge densityh sigma = sigma_(0) cos theta is induced on the ball's surface charge (here sigma_(0) is a constant, theta is a polar angle). Find the magnitude of the resultant electric force acting on an induced charge of the same sign.

Find the electric potential energy of a unifomly charged then spherical shell.

A charge q is placed at the some distance along the axis of a uniformly charged disc of surface cahrge density sigma . The flux due to the charge q through the disc is phi . The electric force on charge q exerted by the disc is

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 has a uniformly distributed charge ,then electric field varies as

Two concentric spherical shells of radii r and R(rltR) have surface charge densities -sigma and +sigma respectively. The variation ofelectric potential V with distance x from the centre O of the shells plotted. Which of the following graphs best depict the variation qualitatively?

Surface area of Spherical Shell

A small section of area DeltaA is removed from a uniform spherical shell with surface mass density sigma and radius R as shown in the figure . Find the magnitude of gravitational field intensity at point P due to the remaining mass .

The electric field inside a spherical shell of uniform surface charge density is