question_answer

A particle of mass M and charge Q moving with velocity v describes a circular path of radius R when subjected to a uniform transverse magnetic field of induction B. The work done by the field, when the particle completes one full circle, is

A)  \[\left( \frac{M{{v}^{2}}}{R} \right)2\pi R\]         

B)         zero

C)  \[BQ2\pi R\]     

D)         \[BQ\,v2\pi R\]