Magnetic Effects & Magnetism

JEE Main level, single correct, medium

116 of 276

Question 116 of 276

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : A 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: (C) Both (A)(\mathbf{A}) and (R)(\mathbf{R}) are true and (R)(\mathbf{R}) is the correct explanation of (A)(\mathbf{A})

If the electron's velocity is along the direction of magnetic field then magnetic force on electron is zero and it will not accelerate.

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