A slab consists of two parallel layers o...

A slab consists of two parallel layers of different materials `4cm` and `2cm` thick and of thermal conductivities `54cals^(-1)m^(-1)K^(-1)` and `36cals^(-1)m^(-1)K^(-1)` respectively. If the faces of the slab are at `100^(@)C` and `0^(@)C` calculate the temperature of the surface dividing the two materials.

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The correct Answer is:

`42.8^(@)C`

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