A) \[\frac{{{\mu }_{0}}qf}{2\pi R}\]
B) \[\frac{{{\mu }_{0}}q}{2\pi f\,R}\]
C) \[\frac{{{\mu }_{0}}\,q}{2f\,R}\]
D) \[\frac{{{\mu }_{0}}\,q\,f}{2\,R}\]
Correct Answer: D
Solution :
The magnetic field at the centre of the circle \[=\frac{{{\mu }_{0}}}{4\pi }\times \frac{2\pi i}{R}=\frac{{{\mu }_{0}}}{2}\frac{(q)}{Rt}\]
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