When a charged particle moves in a magnetic field its kinetic energy __________.

Remains constant

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Increases

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Can decrease

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Become zero

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Solution

The correct option is A Remains constant
The magnetic force acts perpendicular to the velocity of the particle. This causes circular motion. in magnetic field the speed and kinetic energy of the particle remain constant, but the direction is altered at each instant by the perpendicular magnetic force.
Hence the kinetic energy remains constant. Therefore the correct option is (A).

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