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.
JEE MAIN 2022, Medium
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$\overrightarrow{ F }= q (\overrightarrow{ v } \times \overrightarrow{ B })$
$\overrightarrow{ F } \perp \overrightarrow{ V }$
Work done $=\overrightarrow{ F } \cdot \overrightarrow{ S }$
Work done $=0$
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