When an object is immersed in a fluid, which of the following forces will act on the object?
Buoyant force
Both A and B
When an object is immersed in a fluid two forces act on it, gravitational force and buoyant force. Buoyant force is the upward force that acts on this object. It depends on the volume of the block and density of the fluid. Gravitational force is basically the weight W of the body, which acts vertically downward, through the centre of gravity of the body.