Q. When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
A) Energy decreases
B) Energy increases
C) Momentum increases
D) Momentum and energy remain unchanged
Explanation
(d) Since force is perpendicular to direction of motion, energy and magnitude of momentum remains constant
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.