JIPMER2014PhysicsMagnetic Effects of Current
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
Options
- A( M^2 R ) 2 R
- Bzero
- CB Q 2 R
- DB Q 2 R
Correct answer
B. zero
Step-by-step solution
When particle describes circular path in a magnetic field, its velocity is always perpendicular to the magnetic force? Power aligned P= F v & =F co & =90^ P & =0 aligned Hence,But aligned P= F v & =F & =90^ & =0 & = W t W=P t aligned Hence, work done W=0 (everywhere)