Assertion : The buoyant force on a submerged | vedclass

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(D) The buoyant force acts at the centre of buoyancy,which is the centre of mass of the displaced fluid. This point coincides with the centre of mass

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If both the Assertion and Reason are incorrect.

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(D) The buoyant force acts at the centre of buoyancy,which is the centre of mass of the displaced fluid. This point coincides with the centre of mass of the object only if the object is homogeneous (uniform density). Since the object is not necessarily homogeneous,the Assertion is incorrect.The Reason statement is a general principle in mechanics: for a uniform force field (like gravity) acting on a body,the resultant force acts at the centre of mass. However,the buoyant force is not a uniform force field acting on the object itself; it is the resultant of pressure forces acting on the surface of the object. Thus,the Reason is also incorrect.

$Assertion :$ 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.

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$Assertion :$ 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.