1.

A charged particle of mass m and charge q travels on a circular path of radius r that is perpendicular to a magnetic field B. The time taken by the particle to complete one revolution is                                  [AIEEE 2005]

A.            \[\frac{2\pi qB}{m}\]        
B.            \[\frac{2\pi \,m}{q\,B}\]
C.            \[\frac{2\pi \,m\,q}{B}\] 
D.            \[\frac{2\pi \,{{q}^{2}}B}{m}\]
Answer» C.            \[\frac{2\pi \,m\,q}{B}\] 


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