Question

A particle of mass M and charge Q moving with velocity $\overrightarrow{v}$ 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. $\left(\frac{M{v}^2}{R}\right)2\pi R$
• B. $zero$
• C. $BQ2\pi R$
• D. $BQv2\pi R$

Answer 1

Answer: (B)

$zero$

Upon completing a full circle net displacement is 0.
Work done by the magnetic field is 0 because the net displacement caused by the magnetic field is 0.