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A wall is made of equally thick layers A and B of different matierals. Thermal conduvtivity of A is twice that of B. In the stedy state, 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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