Swapnil Saxena
Last Activity: 13 Years ago
Solution: When two materials are joined in series, then the reciprocal of their conductanes are added.
Here the individual conductances of these two slabs are = KA/x and 2KA/4x
the equivalent conducatnce =1/ (x/KA + 4x/2KA) = 1/( x/KA + 2x/KA )= 1/ (3x/KA) = KA/3x
The the rate of transfer of heta through the slab = KA(T2-T1)/3x ---------(ans)
In this way the answer is 1/3