A solid sphere of iron at `2^(@)C` is lying at the bottom of a bucket full of water at `2^(@)C`. If the temperature of the water is increased to `3^(@)C`, the buoyant force on the sphere due to water will

Options

A. increase
B. Be unchanged
C. Decrease
D. Increase or decrease depends upon the numerical values of coefficient of expansion of water and iron.

Answer

A

Explanation

As the temperature of water is increased from `2^(@)C` to `3^(@)C` the density of water increase (remember anomalous behaviour of water), also the volume of sphere increase. Therefore buoyant force on sphere due to water shall increase.