Assertion :The size and shape of the rigid body remains unaffected under the effect of external forces. Reason: The distance between two particles remains constant in a rigid body

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
A rigid body is defined as an object where the distance between any two particles remains constant.
Thus even under external forces, the distance between all particles and hence the size and shape of the body remains the same.
However a soft material may change shape and size on application of external forces.

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