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Q.

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 100ºC and that of copper at 0ºC , the temperature of interface is

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a

80ºC

b

60ºC

c

20ºC

d

40ºC

answer is A.

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Detailed Solution

Question Image

Let θ be temperature of interface
QtBrass=QtCu;4KA(100−θ)x=KA(θ−0)x

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