The centre of buoyancy `B' is the point through which the force of buoyancy is considered to act vertically upwards with a force equal to the weight of water displaced.
It is the centre of gravity of the underwater volume.So when a weight is added the draught will change.Thereby underwater volume changes.So obviously buoyancy changes.
It is the centre of gravity of the underwater volume.So when a weight is added the draught will change.Thereby underwater volume changes.So obviously buoyancy changes.
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