A compound slab is made of two parallel plates of copper and brass of the same thickness and having the thermal conductivities in the ratio 4 : 1. The free face of copper is at 0 ∘ C. The temperature

Question

A compound slab is made of two parallel plates of copper and brass of the same thickness and having the thermal conductivities in the ratio 4 : 1. The free face of copper is at 0 ∘ C. The temperature of the interface is 2 0 ∘ C. What is the temperature of the free face of brass?

TestHub · Accepted Answer

The heat current is equal, so Δ T ∝ k 1 ​ . Copper has Δ T = 2 0 ∘ C, so brass has 4 × 20 = 8 0 ∘ C. The free face is at 20 + 80 = 10 0 ∘ C. D.

Physics - Heat & Thermo Question with Solution | TestHub

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