(A) When a current $I$ flows through a conductor with a temperature difference $\Delta T$ between its ends,the heat developed per unit time is governe

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is proportional to $\Delta T$ and $I$

(A) When a current $I$ flows through a conductor with a temperature difference $\Delta T$ between its ends,the heat developed per unit time is governed by the Thomson effect. The heat produced per unit time (Thomson heat) is given by the formula $H = \sigma I \Delta T$,where $\sigma$ is the Thomson coefficient. Therefore,the heat developed per unit time is directly proportional to both the current $I$ and the temperature difference $\Delta T$.

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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

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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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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

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If the vectors $a \hat{i}+\hat{j}+\hat{k}$,$\hat{i}+b \hat{j}+\hat{k}$,and $\hat{i}+\hat{j}+c \hat{k}$ $(a \neq 1, b \neq 1, c \neq 1, a \neq b \neq c)$ are coplanar,then the value of $\frac{1}{1-a}+\frac{1}{1-b}+\frac{1}{1-c}$ is:

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