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A wall has two layers A and B each made ...

A wall has two layers A and B each made of different materials. (See Fig. 11.21). The layer A is 10 cm thick and B is 20 cm thick The thermal conductivity of A is thrice that of B. Using thermal equilibrium, temperature difference across the wall is `35^(@) C`. What is the temperature difference across the layer A?

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The correct Answer is:
`5^(@) C`
`3KA xx Delta T// 10 = KA (35- Delta t) // 20, 6 Delta t = 35 - Delta t, Delta t = 5^(@) C`
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