Question

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 revolutions/s. The value of magnetic induction in Wb/m${}^2$ at the centre of the ring is

• A. $\frac{{\mu }_{0}qf}{2\pi R}$
• B. $\frac{{\mu }_{0}q}{2\pi fR}$
• C. $\frac{{\mu }_{0}q}{2fR}$
• D. $\frac{{\mu }_{0}qf}{2R}$

Answer 1

The correct option is D $\frac{{\mu }_{0}qf}{2R}$