A particle of mass `M` and charge `Q` moving with velocity `vec(v)` describe 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. `((Mv^(2))/(r))2piR`
B. zero
C. `BQ,2piR`
D. `BQv 2piR`
