Given below are two statements: One is labelled as Assertion (A) and… | JEE Main 2022 (24 Jun, Shift 1)

Q50JEE Main 2022 · 24 JUN · SHIFT 1Easy

Moving Charge in a Magnetic Field

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.

Show answer and solution

Answer: (a)

(R): magnetic force $q(\vec{v} \times \vec{B})$ is perpendicular to the velocity. True.
So it does no work, and speed and kinetic energy stay constant: (A) true and explained by (R).
So the answer is (a).

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