A spherical shell of radius R carries a uniformly distributed charge q. The electrical forces arising cause the ex-pansion of the shell. Find the mechanical stress in the shell.

A uniformly charged thin conducting spherical shell of radius R and charge q is rotated with constant angular velocity omega about a diameter. The magnetic dipole moment of the system is

Electric field at the centre of uniformly charge hemispherical shell of surface charge density sigma is (sigma)/(n epsi_(0)) then find the value of n .

A thick conducting spherical shell of inner radius a and outer radius b is shown in figure. It is observed that the inner face of the shell carries a uniform charge density -sigma . The outer surface also carries a uniform surface charge density +sigma . (a) Can you confidently say that there must be a charge inside the shell? Find the net charge present on the shell. (b) Find the potential of the shell.

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) Using Gauss's law, derive an expression for the electric field intensity at any point outside a uniformly charged thin spherical shell of radius R and charge density sigma C//m^(2) . Draw the field lines when the charge density of the sphere is (i) positive, (ii) negative. (b) A uniformly charged conducting sphere of 2.5 m in diameter has a surface charge density of 100 mu C//m^(2) . Calculate the (i) charge on the sphere (ii) total electric flux passing through the sphere.

A thin circular disk of radius R is uniformly charged with density sigma gt 0 per unit area.The disk rotates about its axis with a uniform angular speed omega .The magnetic moment of the disk is :