Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : In an uniform magnetic field, speed and energy remains the same for a moving

Question

Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In an uniform magnetic field, speed and energy remains the same for a moving charged particle.

Reason (R): Moving charged particle experiences magnetic force perpendicular to its direction of motion.

TestHub · Accepted Answer

The force experienced by the charge particle is perpendicular to the instantaneous velocity at all instants as $\vec{F} = q (\vec{v} \times \vec{B})$ .

Hence, the magnetic force cannot bring any change in the speed of the charged particle. Since, the speed remains constant, the kinetic energy also remains constant.

Physics - Magnetism Question with Solution | TestHub

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