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A composite slab consists of two slabs A...

A composite slab consists of two slabs A and B of different materials but of the same thickness placed one on top of the other. The thermal conductivities of A and B are `k_(1)` and `K_(2)` respectively. A steady temperature difference of `12^(@)C` is maintained across the composite slab. If `k_(1) = K_(2)//2`, the temperature difference across slab A will be:

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