A cylinder of radius R made of material of thermal conductivity 
is surrounded by a cylindrical shell of inner radius 
and outer radius 
made of a material of thermal conductivity 
. The two ends of the combined system are maintained at two different temperatures. There is no loss of heat across the cylindrical surface and the system is in steady state. The effective thermal conductivity of the system is
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
… (i)
… (ii)
… (iii)
… (iv)
Putting in (i) and solving, we get
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