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A wall has two layers A and B, each made of a different material. Both the layers have the same thickness. The thermal conductivity of material of A is twice that of B. Under the thermal equilibrium the temperature difference across the wall is 30?C. The temperature drops in layers A and B will be respectively

[A].	20?C and 10?C	[B].	10?C and 20?C
[C].	15?C and 15?C	[D].	cannot be predicated

Answer: Option A

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