question_answer

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 centre of the ring is

A) \[\frac{{{\mu }_{0}}qf}{2R}\]

B) \[\frac{{{\mu }_{0}}q}{2f\,R}\]

C) \[\frac{{{\mu }_{0}}q}{2\pi f\,R}\]

D) \[\frac{{{\mu }_{0}}qf}{2\pi \,R}\]