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The ends of an element of zinc 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

(a) is proportional to $\Delta\;T$ and $I$ (b) is proportional to $I^3$ and $\Delta T$ (c) is proportional to Thomson coefficient of the metal (d) is proportional to $\Delta T$ only
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(a) is proportional to $\Delta\;T$ and $I$
answered Nov 7, 2013 by pady_1

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