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 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 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.

An infinite cylinder of radius r with surface charge density sigma is rotated about its central axis with angular speed omega . Then the magnetic field at any point inside the cylinder is

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 :

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 thin disc of radius R has charge Q distributed uniformly on its surface. The disc is rotated about one of its diametric axis with angular velocity omega . The magnetic moment of the arrangement is

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 flat insulating disc of radius 'a' carries an excess charge on its surface is of surface charge density sigma C//m^(2) . Consider disc to rotate around the perpendicular to its plane with angular speed omega rad//s / If magnetic field vec(B) is directed perpendicular to the roation axis, then find the torque acting on the disc.

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.

A long, hollow insulating cylinder of radius R and negligible thickness has a uniform surface charge density sigma . The cylinder rotates about its central axis at a constant angular speed omega . Choose the correct option(s):