The ends of an element of zinc wire are kept at a small temperature difference $\Delta T$ and a small…
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
is proportional to $\Delta T$ and /
is proportional to $I^3$ and $\Delta T$
is proportional to Thomson coefficient of the metal
is proportional to $\Delta T$ only
Solution
The heat developed per unit time in given condition is proportional to $\Delta T$ and $I$.