JEE Main Physics question

Physics Systems of Particles and Rotational Motion JEE Main

**Statement 1:** The centre of mass of a proton and an electron, released from their respective positions, remains at rest.

**Statement 2:** The centre of mass remains at rest if no external force is applied.

(A)Assertion is True, Reason is True; Reason is correct explanation for AssertionCorrect
(B)Assertion is True, Reason is True; Reason is not correct explanation for Assertion
(C)Assertion is True, Reason is False
(D)Assertion is False, Reason is True

Answer: (A)

Solution

The Coulomb attraction between the proton and electron is purely internal to the two-particle system, and with no external force and

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Question ID VK-159163