Q101 / 180 · AIIMS 2018 (26 May) · Physics

Assertion : Magnetic field can not change kinetic energy of a moving charge. Reason : Magnetic field can not change velocity vector.

A
If both assertion and reason are true and reason is the correct explanation of assertion.
B
If both assertion and reason are true but reason is not the correct explanation of assertion.
Correct answer
C
If assertion is true but reason is false.
D
If both assertion and reason are false.

Solution

Magnetic force on moving charge is always perpendicular to its velocity. $\vec{F}=q(v \times \vec{B})$ Also, work done by magnetic force on a moving charge is zero.

Hence, the correct answer is option: 'C'.

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