JEE MAIN - Physics (2022 - 24th June Morning Shift - No. 2)
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.
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true but (R) is NOT the correct explanation of (A).
(A) is true but (R) is false.
(A) is false but (R) is true.
Explanation
Magnetic force $$\overrightarrow F \bot \overrightarrow v $$
$$ \Rightarrow {W_b} = 0$$
$$ \Rightarrow \Delta KE = 0$$ and speed remains constant.
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