Physics
General
Easy
Question
The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and 2 and thickness and 4, respectively are and . The rate of heat transfer through the slab, in a steady state is , with equals to

 1/3
 2/3
 1/3
The correct answer is: 1/3
Let the temperature of common interface be . Rate of heat flow
=
And =
In steady state, the rate of heat flow should be same in whole system
=
(i)
Hence, heat flow from composite slab is
= (ii)
Accordingly, (iii)
By comparing Eqs. (ii) and (iii), we get
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