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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 material. Both the layers have the same thickness. The thermal conductivity of the material of A is twice that of B . Under thermal equilibrium, the temperature difference across the wall is `36^@C.` The temperature difference across the layer A is

A

`6^@ C`

B

`12^@ C`

C

`18^@ C`

D

`24^@ C`

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The correct Answer is:
B
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