Assertion :The buoyant force on a submerged rigid object can be considered to be acting at the centre of mass of the object. Reason: For a rigid body a force field distributed uniformly through its volume can be considered to be acting at the centre of mass of the 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 C Assertion is correct but Reason is incorrect
Whenever any linear force acts on an object, the object behaves as if the whole mass is concentrated at one specific point. This point is known as the centre of mass.
If any force field such as electric, magnetic gravitational etc., is acting uniformly then the forces are acting along straight lines parallel to each other. It can't be assumed to be acting on only one point.

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