A block of iron is kept at the bottom of a bucket full of water at $2^{\circ} C$ . The water exerts a buoyant force on the block. If the temperature of the water is increased by $1^{\circ} C$ the temperature of iron block increases by $1^{\circ} C$ . The buoyant force on the block by water.

will increase

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will decrease

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will not change

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may decrease or increase depending on the values of their coefficient of expansion

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Solution

The correct option is A will increase
Buoyancy Force (B) = ρ V g Where, ρ = Density of Fluid,
Pure water has its highest density of 1000 kg/m3 (1.940 slugs/ft3) at temperature 4 $°$ C (39.2 $°$ F). and density increases with temprature till 4 degree and then it decreases.
So, The buoyant force on the block by water will increase.
Answer (A) will increase

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A block of iron is kept at the bottom of a bucket full of water at 2∘C. The water exerts a buoyant force on the block. If the temperature of the water is increased by 1∘C the temperature of iron block increases by 1∘C. The buoyant force on the block by water.

A block of iron is kept at the bottom of a bucket full of water at $2^{\circ} C$ . The water exerts a buoyant force on the block. If the temperature of the water is increased by $1^{\circ} C$ the temperature of iron block increases by $1^{\circ} C$ . The buoyant force on the block by water.