Question

From which point does buoyant force act?? ​

Answer 1

answer

Where does the buoyant force act in upward direction at the centre ... In a special case of the above generalization, if the only other external force is gravity, then that point is the centre of gravity. That's why the net buoyant force acts at the centre of gravity of the displaced fluid, and opposite to the direction of gravity.

Answer 2

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The upward buoyancy force on an object acts through the center of buoyancy.