Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

Buoyancy is always equal to the weight of the displaced fluid.

Right @Salahuddin.

Because buoyancy is always equal to the weight of the displaced fluid.

Whenever there exist an unbalanced force acceleration comes into action so if buoyancy gets more than the weight of body than it will go up but as its presence from liquid decreases hence the fluid displaced by the body reduces and hence the force of buoyancy also reduces after a time it becomes equal to wt of body.

Also, how can anybody say buoyancy greater or lower than wt of liquid displaced it will always be equal to that.

Buoyancy is equal to the weight of the liquid displaced.

Here sentence is wrong.

It should have been like "the body will float if buoyant force is equal to the WEIGHT OF THE BODY".

Rise up F>w.
Sink F<w.
Float F=w.

If equal the body will partially floats only top surface of the body will apear remaining in water so body will float only when bouancy is more then the weight of the liquid desplaced.

According to me, both A & C are correct.

I think the answer should be equal to.

Buoyancy force itself is calculated as the weight of fluid displaced.
For floating body,

Buoyancy force > Weight of body.
Or if they both equal.