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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

A) `6^(@)C`

B

B) `12^(@)C`

C

C) `18^(@)C`

D

D) `24^(@)C`

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The correct Answer is:
B
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