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Two ends of a uniform rod of thermal conductivity k and cross-sectional area A are maintained at different but constant temperature. At any point on the rod, the temperature gradient is $\frac{d T}{d l}$ . If $I$ be the thermal current in the rod then

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$I \propto A$

$I \propto A^{0}$

$I \propto \frac{1}{(\frac{d T}{d l})}$

$I \propto \frac{d T}{d l}$

answer is A, B.

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Detailed Solution

$\frac{d Q}{d t} =$ Thermal current I $= k A (\frac{d T}{d l})$

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