AIIMS 2019 Physics Properties of Centre of Mass Assertion Reason Question
Assertion: The centre of mass of a proton and an electron, released from their respective positions remains at rest. Reason: The centre of mass remains at rest, if no external force is applied.
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 center of mass of a system remains at rest if no external forces act on it, and since the proton and electron are released from rest, their center of mass will also remain at rest. The reason is also true, as it accurately describes the condition for the center of mass to remain stationary. Options B, C, and D are incorrect because they misrepresent the relationship between the assertion and reason; both statements are true and the reason correctly explains the assertion. This concept illustrates the principle of conservation of momentum in a closed system.
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