Two cylindrical bars are conducting heat from a higher temperature region at THo

Question

Two cylindrical bars are conducting heat from a higher temperature region at THot to a cooler region at temperature TCold. The cylinders have identical lengths and cross-sectional areas, but are made from two different metals. In the drawing below, the cylinders are arranged in series. If cylinder B was made of the same material as cylinder A, then the temperature in the interface between cylinder A and B would be equal to (THot + TCold)/2. However, in the case shown in the drawing, material A has twice the thermal conductivity of material B. Which of the following choices best represents the temperature of the interface for the situation shown?

Explanation / Answer

the interfase temparature is greater than (THot+TCold)/2

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