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A wall has two layers A and B each made of different materials. Both the layers have the same thickness. The thermal conductivity of materials A is twice of B. Under thermal equilibrium temperature difference across the layer B is `36^@C`. The temperature difference across 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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