Question
What will happen if the lower portion of a ship is made light so that centre of buoyancy lies below the centre of gravity of the ship?
Solution
The ship will be in unstable equilibrium if the centre of buoyancy of the ship lies below the centre of gravity. If due to some sea disturbance, ship gets disturbed, the torque produced by weight of the ship and buoyant force will take the ship away from equilibrium position and ship will tumble down.
