Question

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 )2pi R`
B. zero
C. `BQR pi R`
D. `BQv 2pi R`

Answer 1

Correct Answer - B
When particle descirbes circular path in a magnetic field its velocity is always perpendicular to the magnetic force thus work done by the fielf is zero