The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and  and thickness and , respectively are and . The rate of heat transfer through the slab, in a steady state is  with equals to







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Correct option is D)

The thermal resistance of both the blocks will be

and respectively. Since the two resistors are in series, (as same heat current will flow through both), equivalent thermal resistance will be

Thus, heat current will be 


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