A) \[\frac{2\pi m}{qB}\]
B) \[\frac{qB}{2\pi m}\]
C) \[\frac{qB}{\pi m}\]
D) \[\frac{\pi m}{qB}\]
Correct Answer: B
Solution :
\[R=\frac{mv}{Bq}\] Time period, \[T=\frac{2\pi R}{v}=\frac{2\pi m}{Bq}\] Frequency, \[n=\frac{1}{T}=\frac{Bq}{2\pi m}\]
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