A) \[\frac{{{\mu }_{0}}qf}{2R}\]
B) \[\frac{{{\mu }_{0}}q}{2f\,R}\]
C) \[\frac{{{\mu }_{0}}q}{2\pi f\,R}\]
D) \[\frac{{{\mu }_{0}}qf}{2\pi R}\]
Correct Answer: A
Solution :
We know \[B=\frac{{{\mu }_{0}}i}{2R}\] \[q=it\Rightarrow i=\frac{q}{t}=qf\] \[\left[ \because \,\,f=\frac{1}{t} \right]\] \[B=\frac{{{\mu }_{0}}qf}{2R}\]
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