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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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