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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

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The correct Answer is:
12
`K_(A)=2K_(B)=2K`
`((36-T)/(d))K_(A)A=((T-0)/(d))K_(B)A`
`(36-T)2K=TK`
`T=(72)/(3)=24`
`DeltaT` = temp difference `=36-24=12`
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