AIIMS 2017 Physics Electron Motion Assertion Reason Question
Assertion: The magnetism of the magnet is due to the spin motion of electron. Reason: The dipole moment of electron is smaller than that due to orbit motion around nucleus.
If both assertion and reason are true and reason is correct explanation of assertion.
If both assertion and reason are true and reason is not 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 the magnetism of a magnet indeed arises from the intrinsic spin of electrons, which generates a magnetic dipole moment. The reason is also true; while the dipole moment due to electron spin is significant, the orbital motion of electrons around the nucleus contributes to the overall magnetic properties as well, but is generally smaller in magnitude compared to the intrinsic dipole moment from spin. Therefore, the reason correctly explains the assertion, making option A the right choice. Options B, C, and D are incorrect because they misrepresent the relationship between the assertion and reason, either by claiming one is false or by incorrectly asserting that the reason does not explain the assertion.
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