Assertion :The mass of a body cannot be considered to be concentrated at the centre of mass of the body for the purpose of computing its moment of inertia. Reason: Then the moment of inertia of every body about an axis passing through its centre of mass would be zero.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Point of center of gravity of the object cannot co-incide with its center of mass for rotational motion the spatial distribution of mass of the body around rotational axis is very important. Because rotational inertia depends on radius of mass from the center of rotation.
Hence, we cannot consider rotating body as point mass if considered center of mass.
If axis passes through center of mass then moment of inertia is zero.
Hence, both assertion and reason are correct and reason is the correct explanation for assertion.

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