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 of complete one revolution is :

Question

( A ) $\frac{2 \pi m q}{B}$
( B ) $\frac{2 \pi q B}{m}$
( C ) $\frac{2 \pi m}{qB}$
( D ) $\frac{2 \pi q^2B}{m}$