Q. An electron and a proton are projected at right angles to a uniform magnetic field with the same kinetic energy. Then
A) The electron trajectory will be less curved than proton trajectory
B) The electron trajectory will be more curved than proton trajectory
C) Both the trajectories will be equally curved
D) Both particles continue to move along a straight line
Explanation
(b) $\ r = \frac{mv}{qB} = eV = evB\ \Rightarrow v = \frac{E}{B}$
Radius of electron’s orbit will be more, so proton’s trajectory will be less curved.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.