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The rate of flow of heat through a copper rod with temperature difference $28^{\circ} \mathrm{C}$ is $1400 \mathrm{cal} \mathrm{s}^{-1}$. The thermal resistance of copper rod will be
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$0.02 \frac{{ }^{\circ} \mathrm{Cs}}{\mathrm{cal}}$
Thermal resistance $=\frac{\text { Temp.difference }}{\text { Thermalcurrent }}=\frac{28}{1400}=0.02{ }^{\circ} \mathrm{Cs} / \mathrm{cal}$
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