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. 12
- A. 6
- B. 12
- C. 18
- D. 24
Explanation
For layers in series, temperature drop is proportional to thermal resistance L/k. With equal thickness and kA = 2kB, layer A has half the resistance of B, so its drop is one-third of 36°C, or 12°C.
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