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A charged particle moves through a magnetic field perpendicular to its direction.then a)the momentum changes but the kinectic energy is constant b)both momentum and kinetic energy of the particle are not constant c)both,momentum and kinectic energy of the particle are constant d)kinectic energy changes but the momentum is constant

A charged particle moves through a magnetic field perpendicular to its direction.then
a)the momentum changes but the kinectic energy is constant
b)both momentum and kinetic energy of the particle are not constant
c)both,momentum and kinectic energy of the particle are constant
d)kinectic energy changes but the momentum is constant

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2 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
3 years ago
When a charge particle enters a magnetic field at a direction perpendicular to the direction of motion, the path of the motion is circular. In circular motion the direction of velocity changes at 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 by21​mv2andv2is the square of the magnitude of velocity which does not change.
In this question, we could not infer that where the momentum mentioned here is tangential or angular.
Vikas TU
14149 Points
3 years ago
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.

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