The ends of an element of zinc wire are kept at a small temperature difference $\Delta T$ and a small current $I$ is passed through the wire. Then,the heat developed per unit time
- Ais proportional to $\Delta T$ and $I$
- Bis proportional to $I^3$ and $\Delta T$
- Cis proportional to Thomson coefficient of the metal
- Dis proportional to $\Delta T$ only
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