A charged particle moves through a magnetic field perpendicular to its direction. Then
A charged particle moves through a magnetic field perpendicular to its direction. Then
both momentum and kinetic energy of the particle are changed
its momentum changes but its kinetic energy remains constant
its kinetic energy changes but momentum remains constant
both momentum and kinetic energy of the particle remains constant
Solution
Magnetic force is perpendicular to the direction of motion of the particle.
Therefore no external work is done and the kinetic energy remains constant. The particle undergoes uniform circular motion, however due to change in direction of motion velocity is not constant. So the momentum is not constant, during uniform circular motion. Therefore, option (B) is correct.