$A$ thin ring of radius $R$ carries a uniformly distributed charge. The ring rotates at a constant speed $N$ r.p.s. about its axis perpendicular to the plane. If $B$ is the magnetic field at the centre,the charge on the ring is ($\mu_0 =$ permeability of free space).
- A$\frac{\mu_0 N}{2 RB}$
- B$\frac{RB}{2 \mu_0 N}$
- C$\frac{\mu_0 N}{RB}$
- D$\frac{2 RB}{\mu_0 N}$
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