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.
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]
- A
Both $(A)$ and $(R)$ are true and $(R)$ is the correct explanation of $( A )$
- B
Both $(A)$ and $(R)$ are true but $(R)$ is NOT the correct explanation of $( A )$
- C
$(A)$ is true but $(R)$ is false
- D
$(A)$ is false but $(R)$ is true.
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$(a)$ A magnetic field that varies in magnitude from point to point but has a constant direction (east to west) is set up in a chamber. A charged particle enters the chamber and travels undeflected along a straight path with constant speed. What can you say about the initial velocity of the particle?
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