A wall has two layers 
and 
each made of different materials. The layer 
is 10 cm thick and 
is 20 cm thick. The thermal conductivity of 
is thrice that of 
. Under thermal equilibrium, temperature difference across the wall is 
. The difference of temperature across the layer 
is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
Here, 
and 
So let 
, then 
Heat current, 
Now, temperature difference across A
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