AIIMS 2019 Physics Motion of Charged Particles in Magnetic Field Assertion Reason Question
Assertion: The kinetic energy does not change when a particle moves in uniform magnetic field.
Reason: The velocity of the particle is not affected by magnetic field.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Correct Answer
Detailed Explanation
Option A is correct because both the assertion and reason accurately describe the behavior of a charged particle in a uniform magnetic field. The assertion states that the kinetic energy remains constant due to the perpendicular force exerted by the magnetic field, which does not work on the particle since the force is always at a right angle to the velocity vector, thus maintaining constant speed and kinetic energy. Other options are incorrect because they either misrepresent the relationship between the assertion and reason or incorrectly state the truth value of either statement.
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