A wall has two layers A and B, each made of a different material. Both the layers have the same thickness. The thermal conductivity of material of A is twice that of B. Under the thermal equilibrium the temperature difference across the wall is 30°C. The temperature drops in layers A and B will be respectively A)15°C and 15°C B)cannot be predicated C)37,500 kg D)10°C and ²0°C E)20°C and 10°C

Question

Quizplus · Accepted Answer

The temperature drop across each layer is inversely proportional to its thermal conductivity, given the same thickness. Since A has twice the thermal conductivity of B, the temperature drop across A will be half that across B. With a total temperature difference of 30°C, this results in a 20°C drop across A and a 10°C drop across B.

A Wall Has Two Layers a and B, Each Made