Charge q is uniformly spread on a thin ring of radius R. The ring rotates about its axis with a uniform frequency f Hz. The magnitude of magnetic induction at the center of the ring is:

A thin ring of radius R metre has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolution/s. The value of magnetic induction in Wb m^(-2) at the centre of the ring is

A thin ring of radius R metre has charge q coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of f revolution/s. The value of magnetic induction in Wb m^(-2) at the centre of the ring is

A thin-ring of radius R metre has charge q coulomb uniformly spread on it . The ring rotates about its axis with a constant frequency of f revolution//s .The value of magnetic induction in omegabm^-2 at the centre of the ring is :

Charge q is uniformly distributed over a thin half ring of radius R . The electric field at the centre of the ring is

A charge q is unifomly distrybuted over a nonconducting ring of radius R. The ring is rotated about an axis passing through its centre and perpendicular to the plane of the ring with frequency f. The ratio of electric potential to the magnetic field at the centre of the ring depends on.