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A cylinder of radius R made of a materia...

A cylinder of radius `R` made of a material of thermal conductivity `K_(1)` is surrounded by cylindrical shell of inner radius `R` and outer radius `2R` made of a material of thermal conductivity `K_(2)` The two ends of the combined system are maintained at two different temperatures There is no loss of heat across the cylindrical surface and system is in steady state What is the effective thermal conductivity of the system
.

A

`K_(1)+K_(2)`

B

`(K_(1)K_(2))/(K_(1)+K_(2))`

C

`(K_(1)+3K_(2))/(4)`

D

`(3K_(1)+K_(2))/(4)`

Text Solution

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The correct Answer is:
C
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