A slab consists of two parallel layers of copper and brass of the same thickness and having thermal conductivities in the ratio 1 : 4. If the free face of brass is at 100°C and that of copper at 0°C, the temperature of interface is(a) 80°C(b) 20°C(c) 60°C(d) 40°C
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Answer:
a) 80°C
Explanation:
Layers of the slab = 2 = copper and brass (Given)
Ratio of the thermal conductivity = 1:4 (Given)
Temperature of brass = 100°C (Given)
Temperature of copper = 0°C
θ = k1θ +k2θ/ k1+k2
This is as - k1/k2 = 1/4
Thus, if K1 = k , then k2 = 4k
= θ = k × 0 + 4k × 100 / 5k
= 80
Therefore, if the free face of brass is at 100°C and that of copper at 0°C, the temperature of interface is 80°C.
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If the free face of brass is at 100∘C and that of copper at 0∘C , the ... and brass of the same thickness and having thermal conductivities in the ratio 1:4. If ...
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