A thin disc of dielectric material, with a total charge +q distributed uniformly over its surface rotates n times per second about an axis perpendicualr to the surface of the disc and passing through its center. Find the magnetic induction at the center of the disc. The radius of the disc is equal to r.

A thin dielectric disc uniformly distritbuted with charge q has radius r and is rotated n times per second about an axis perpendicular to the disc and passing through the centre. Find the magnetic induction at the centre of the disc.

A this disc of dielectric material, with a total charge +q distributed uniformly over its surface, rotates with angular speed omega about an axis perpendicular to the disc and passing through its centre .Find the magnetic moment with its angular momentum , assuming that its mass is m. [Hint : Consider a ring of radius x and thickness dx. Calculate charge on it and then the current consituited by its rotation .Find its magnetic moment and integrate for the whole disc.]

Radius of gyration of disc rotating about an axis perpendicular to its plane passing through its centre is (If R is the radius of disc)

Radius of gyration of disc rotating about an axis perpendicular to its plane passing through through its centre is (If R is the radius of disc)

In a Faraday disc dynamo, a metal disc of radius R rotates with an angular velocity about an axis perpendicular to the plane of the disc and passing through its centre.The disc is placed in a magnetic field B acting perpendicular to the plane of the disc.Determine the induced emf between the rim and the axis of the disc.

Find the moment of inertia of a uniform half-disc about an axis perpendicular to the plane and passing through its centre of mass. Mass of this disc is M and radius is R.

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.