Answer :


Thomson effect is the process where the evolution or absorption of heat takes place when electric current passes through a circuit composed of a single material that has a temperature difference along its length.

If a metallic conductor has non-uniform temperature distribution along its length, the density of the free electrons varies for different sections.

The electrons diffuses from the region with higher concentration to the region with lower concentration of free electrons.

Thus, the free-electron density in a material depends on temperature for the Thomson effect.

Hence, option C is the correct option.

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Consider the statHC Verma - Concepts of Physics Part 2