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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 con-ductivity `K_(2)` The two ends of the combined system are maintained at two differnet tem-peratures 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)`

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