Q. A particle moving in a magnetic field increases its velocity then its radius of the circle
A) Decreases
B) Increases
C) Remains the same
D) Becomes half
Explanation
(b) For motion of a charged particle in a magnetic field, we have $r = mv/qB$ $i.e.\ r \propto v$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.