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$\frac{\mu_0 q f}{2R}$
- B$\frac{\mu_0 q f}{2\pi R}$
- C$\frac{\mu_0 q}{2fR}$
- D$\frac{\mu_0 q}{2\pi fR}$
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