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  4. Assertion: The energy of charged particle moving in a uniform magnetic field does not change. Reason: Work done by magnetic field on the charge is zero.

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Q. Assertion : The energy of charged particle moving in a uniform magnetic field does not change.
Reason : Work done by magnetic field on the charge is zero.

AIIMSAIIMS 2008Moving Charges and Magnetism

Solution:

The force on a charged particle moving in a uniform magnctic field always acts in direction perpendicular to the direction of motion of the charge. As work done by magnetic field on the charge is zero. $[H=1: S \cos \theta]$, so the energy of the charged particle does not change.