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
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