The temperature of the two outer surfaces of a composite slab, consisting of two materials K and 2K and thickness x and 4x, respectively, are T 2 and T 1 (T 2 > T 1 ). The rate of heat transfer through the slab, in a steady state is 
with f equal to–
Text Solution
Verified by ExpertsThe correct answer is:
D
Let the temperature of common interface be 
Rate of heat flow
In steady state, the rate of heat flow should be same in whole system i.e.,
Hence, heat flow from composite slab is
… (ii)
[from Eq. (i)]
Accordingly,
By comparing Eqs. (ii) and (iii), we get
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