AIIMS 2019 Physics Magnetic Force Assertion Reason Question
The magnetic force on the charged particle is given by, F_B = qvBsinθ. As the particle is released from rest therefore, there may be no force on the particle and hence, it may remain stationary. As the force on the particle is zero therefore, magnetic field does no work on the particle. Hence, both assertion and reason are false.
Both assertion and reason are true, and reason is the correct explanation of assertion.
Both assertion and reason are true, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Both assertion and reason are false.
Correct Answer
Detailed Explanation
The assertion is true because a charged particle released from rest in a magnetic field experiences no magnetic force (F_B = qvBsinθ) if its velocity (v) is zero, meaning it remains stationary. The reason is also true, as magnetic fields do not perform work on charged particles since the magnetic force is always perpendicular to the velocity, resulting in no energy transfer. Other options are incorrect because they either misinterpret the relationship between force and motion in magnetic fields or incorrectly state the truth of the assertion and reason. Understanding that magnetic forces can influence charged particles only when they are in motion is crucial in electromagnetism.
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