Heat TransferHard

Question

The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity K and 2K and thickness x and 4x respectively are T2 and T1(T2 > T1). The rate of heat transfer throgh the slab, in a steady state is f, with f equal to : -
       

Options

A.1
B.1/2
C.2/3
D.1/3

Solution

Let temp. of interface be T
then

⇒ f =

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