Three identical rods 
and C are placed end to end. A temperature difference is maintained between the free ends of A and C. The thermal conductivity of B is thrice that of C and half of that of A. The effective thermal conductivity of the system will be ( 
is the thermal conductivity of 
)
Text Solution
Verified by ExpertsA
Let L be length and A be area of cross-section of each rod respectively.
Given: 
Thermal resistance of 
Thermal resistance of 
Thermal resistance of 
The electrical equivalent circuit is as shown in the figure.
Here, the rods are connected in series.
Let 
be effective thermal conductivity of the system.
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