1.

A charged particle of mass m and charge q describes circular motion of radius r in a uniform magnetic field of strength B. The frequency of revolution is      [MP PET 1997; RPET 2001]

A.            \[\frac{Bq}{2\pi m}\]        
B.            \[\frac{Bq}{2\pi rm}\]
C.            \[\frac{2\pi m}{Bq}\]        
D.            \[\frac{Bm}{2\pi q}\]
Answer» B.            \[\frac{Bq}{2\pi rm}\]


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