Question
If a charge particle enters perpendicularly in the uniform magnetic field, then:
energy and momentum both remains constant
energy remains constant but momentum changes
both energy and momentum changes
energy changes but momentum remains constant
Solution
B.
energy remains constant but momentum changes
The magnetic field does not work, so kinetic energy and speed of a charged particle in a magnetic field remains constant. The magnetic force, acting perpendicular to the velocity of the particle, will cause circular motion.
