Question

A body is floating inside liquid if we increase temperature then what changes occur in buoyancy force. (Assume body is always in floating condition)

• A. Buoyant force increases
• B. Buoyant force decreases
• C. Buoyant force remains the same
• D. None of the above

Answer 1

Answer: (C)

Buoyant force remains the same

Body is in equilibrium so $mg=B$ and gravitational force does not change with change in temperature.

So buoyancy force remains constant.

By increasing temperature, density of liquid decreases, so volume of body inside the liquid increases to keep the buoyancy force constant for equal to gravitational force.