A sphere of radius R, uniformly charged with the surface charge density `sigma` rotates around the axis passing through its centre at an angular velocity. (a) Find the magnetic induction at the centre of the rotating sphere. (b) Also, find its magnetic moment.

A non-conducting thin disc of radius R charged uniformly over one side with surface density sigma , rotates about its axis with an angular velocity omega . Find (a) the magnetic field induction at the centre of the disc (b) the magnetic moment of the disc.

A non-conducting thin disc of radius R and mass m having charge uniformly over one side with surface density sigma rotates about its axis with an angular velocity omega . Find : (a) the magnetic induction at the centre of the disc, (b) the magnetic moment of the disc. ( c) the ratio of magnetic moment and angular momentum of disc.

A non-conducting thin disc of radius R charged uniformly over one side with surface density s rotates about its axis with an angular velocity omega . Find (a) the magnetic induction at the centre of the disc, (b) the magnetic moment of the disc.

A solid sphere of radius r and mass m rotates about an axis passing through its centre with angular velocity omega . Its K.E . Is

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 non-conducting sphere of radius R = 50 mm charged uniformly with surface density sigma = 10.0 muC//m^(2) rotates with an angular velocity omega = 70 rad/s about the asxis passign thorugh its centre. Find the magnetic induction at the centre of the sphere.

A solid of radius 'R' is uniformly charged with charge density rho in its volume. A spherical cavity of radius R/2 is made in the sphere as shown in the figure. Find the electric potential at the centre of the sphere.

A conducting ring of radius r having charge q is rotating with angular velocity omega about its axes. Find the magnetic field at the centre of the ring.

A flat dielectric disc of radius R carries an exces charge on its surface. The surface charge density sigma . The disc rotastes about an axis perpendicular to its lane passing thrugh the centre with angulasr velocity omega . Find the toruque on the disc if it is placed in a uniform magnetic field B directed perpendicular to the rotation axis.

The M.I. of the solid sphere of density 'rho' and radius 'R' about an axis passing through its centre is given by