PQ is a fully lagged metal bar with a section X Y of a material of lower thermal conductivity (Figure 4.34). The thermal conductivities of the two materials are independent of temperature. Ends P and

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PQ is a fully lagged metal bar with a section X Y of a material of lower thermal conductivity (Figure 4.34). The thermal conductivities of the two materials are independent of temperature. Ends P and Q are kept at different temperatures. In the steady state, the temperature difference across X Y would be independent of:

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The heat current is the same everywhere, so Δ T X Y ​ = H R X Y ​ . It depends on the end temperatures, the conductivities and the thickness of X Y . Where X Y sits along the bar does not matter. D.

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