A hollow sphere has charge `'q'` which is uniformly distributed over its surface and rotating about its axis .Find the magnetic moment of the sphere

A plastic disc of radius 'R' has a charge 'q' uniformly distributed over its surface. If the dis is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

A plastic disc of radius 'R' has a charge 'q ' uniformly distributed over its surface. If the disc is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

A plastic disc of radius 'R' has a charge 'q ' uniformly distributed over its surface. If the disc is rotated with a frequency 'f' about its axis, then the magnetic induction at the centre of the disc is given by

A ring of dielectric material, with a total charge +q distributed uniformly over its surface, rotates with angular speed omega. Find the magnetic moment of the ring .Compare its magnetic moment with its angular momentum , assuming that its mass is m.

Consider a nonconductiing disc of radius r and mass m which has a charge q distributed uniformly over it. The disk is rotated about its axis with an angluar speed omega .Magnetic moment of the disc is 1/Nqomegar^(2) .then find value of N .

There is a hemispherical shell having charge Q uniformly distributed on its surface. Radius of the shell is R. Find electric potential and field at the centre (of the sphere).

A non conducting disc of radius R , charge q is rotating about an axis passing through its centre and perpendicular to its plane with an angular velocity omega charge q is uniformly distributed over its surface. The magnetic moment of the disc is