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

Options

A. `(mu_0qf)/(2R)`
B. `(mu_0qf)/(2fR)`
C. `(mu_0qf)/(2pifR)`
D. `(mu_0qf)/(2piR)`

Answer

A