A charged particle moves through a magnetic field perpendicular to its direction. ThenA. Kinetic energy changes but the momentum is constantB. the momentum changes but the kinetic energy is constantC. both momentum and kinetic energy of the particle are not constantD. both momentum and kinetic energy of the particle are constant

A charged particle moves through a magnetic field perpendicular to its

1.	A charged particle moves through a magnetic field perpendicular to its direction. ThenA. Kinetic energy changes but the momentum is constantB. the momentum changes but the kinetic energy is constantC. both momentum and kinetic energy of the particle are not constantD. both momentum and kinetic energy of the particle are constant
Answer» Correct Answer - B NOTE : When a charged particle enters a magnetic field at a direction perpendicuar to the direction of motion , the path of the motion is circular . In circular motion the direction of velocity changes aat every point ( the magnitude remains constant). Therefore , the tangential momentum will change at every point. But kinetic energy will remain constant as it is given by `(1)/(2) mv^(2) and v^(2)` is the square of the magnitude of velocity which does not change.

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