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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.

1. Both (A) and (R) true and (R) is the correct explanation of (A) .
2. Both (A) and (R) are true but (R) is NOT the correct explanation of (A) .
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Correct answer: Both (A) and (R) true and (R) is the correct explanation of (A) .

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