MHT CET 2022 Physics question

A charged particle moves through a magnetic field perpendicular to its direction. Then

(A)both momentum and kinetic energy of the particle are changed
(B)its momentum changes but its kinetic energy remains constantCorrect
(C)its kinetic energy changes but momentum remains constant
(D)both momentum and kinetic energy of the particle remains constant

Answer: (B)

Solution

The magnetic force is always perpendicular to the velocity, so it does no work (). By the work-energy theorem the kinetic energy (speed) stays constant. However the force changes the

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Question ID VK-095705