Question

The density of a fluid and buoyancy are related. As the density of a fluid…

• A. increases, the buoyant force decreases.
• B. decreases, the buoyant force increases.
• C. increases, the buoyant force remains the same.
• D. decreases, the buoyant force decreases.

Answer 1

The correct option is D decreases, the buoyant force decreases.

Buoyancy is the tendency to rise or float in a fluid. The upward force exerted on objects submerged in fluids is called the buoyant force.
The formula for buoyant force is
$⟹F=\rho vg=mg$
Where $\rho$ is the density, $\text{v}$ is the volume, and $\text{m}$ is the mass of the displaced fluid. '$\text{g}$' is the acceleration due to gravity $=9.8{\text{m s}}^{-2}$.
So, the denser the fluid is, the greater the buoyancy and the buoyant force and vice versa.