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Eamcet Physics
1 st Year : Unit 7.10 ( Properties of Bulk Matter ) - Transfer of Heat

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A cylinder of radius R made of material of thermal conductivity K₁ is surrounded by a cylindrical shell of inner radius R and outer radius 3R made of material of thermal conductivity K₂. 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. K₁ + K₂

B. K₁K₂/(K₁ + K₂)

C. (8K₁ + K₂)/9

D. (K₁ + 8K₂)/9

E. None of the above

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Correct choice: D

Explanation:

None

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Eamcet Physics 1 st Year : Unit 7.10 ( Properties of Bulk Matter ) - Transfer of Heat

Eamcet Physics
1 st Year : Unit 7.10 ( Properties of Bulk Matter ) - Transfer of Heat