A charged particle moves through a magnetic field perpendicular to its direction. Then : (A) bot...

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A charged particle moves through a magnetic field perpendicular to its direction. Then :
(A) both momentum and kinetic energy of the particle are not constant
(B) both momentum and kinetic energy of the particle are constant
(C) kinetic energy changes but the momentum is constant
(D) the momentum changes but the kinetic energy is constant
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