AIIMS 2019 Physics Motion of Charged Particles Assertion Reason Question
Assertion: If a charged particle is released from rest in a region of uniform electric and magnetic fields parallel to each other, it will move in a straight line. Reason: The electric field exerts no force on the particle but the magnetic field does.
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
The assertion is true because a charged particle in a uniform electric field experiences a force due to the electric field, causing it to accelerate, while the magnetic field does not exert a force on a particle at rest. The reason is false because the magnetic field exerts no force on a stationary charged particle; it only affects moving charges. Therefore, option C is correct as the assertion is true, but the reason is incorrect. Options A and B are incorrect because they rely on the reason being true, while option D is incorrect since the assertion is indeed true.
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