A charged particle moves through a magnetic field perpendicular to its direction. Then
A
Kinetic energy changes but the momentum is constant
B
the momentum changes but the kinetic energy is constant
C
both momentum and kinetic energy of the particle are not constant
D
both momentum and kinetic energy of the particle are constant
Text Solution
Verified by Experts
The correct Answer is:
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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