$A$ thin ring of radius $R$ meter 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 center of the ring is $(\mu_0 = \text{Permeability of free space})$
- A$\frac{\mu_0 q f}{2 \pi R}$
- B$\frac{\mu_0 q}{2 \pi R}$
- C$\frac{\mu_0 qf}{2 R}$
- D$\frac{\mu_0 q}{2 \pi fR}$
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