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

Answer

12

Explanation

`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`