Question

Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities and respectively. The equivalent thermal conductivity of the slab is

A

B

C

D

Medium
Solution
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Correct option is C)

The thermal resistances can be added as they are in series. But, note that the width of the combined slab is twice the width of individual slab. 
So, we have:

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