Given below are two statements. One is labelled as Assertion (A) and… | JEE Main 2025 (24 Jan, Shift 2)

Q16JEE Main 2025 · 24 JAN · SHIFT 2Easy

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): An electron in a certain region of uniform magnetic field is moving with constant velocity in a straight line path.

Reason (R): The magnetic field in that region is along the direction of velocity of the electron. In the light of the above statements, choose the correct answer from the options given below:

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Answer: (b)

If $\vec{B} \parallel \vec{v}$ , then $F = evB\sin 0^\circ = 0$ .
No force means constant velocity in a straight line, so (A) is true and (R) explains it.
So the answer is (b).

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Moving Charge in a Magnetic Field question from JEE Main 2025 (24 Jan, Shift 2)

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