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Questions  

The temperatures across two different slabs A and B are shown in the steady state (as shown in figure).The ratio of thermal conductivities of A and B is

a
2:3
b
3:2
c
1:1
d
5:3

detailed solution

Correct option is B

dQdt×1A=KA(50−30)3          (for slab A)=KB(50−20)3                              (for slab B)       2KA=3KBor,  KA/KB=3/2

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