A wall has two layers of materials A and B; each made of a different material. Both the layers have the same thickness. The thermal conductivity of material A is twice that of B. Under the equilibrium, the temperature difference across the wall is 36°C. The temperature difference across the layer A is ______________ °C?
Correct answer: B
Explanation
Since the layers have the same thickness and conductivity of A is twice that of B, the temperature drop across A will be half the total temperature drop.