Question

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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A

B

C

D

Hard

Solution

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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 


Hence,

Solve any question of Thermal Properties Of Matter with:-

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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 , where equals to :

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