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A cylinder of radius r and made of material of thermal conductivity k 1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k 2. Net conductivity would be

A cylinder of radius r and made of material of thermal conductivity k 1 is surrounded by a cylindrical shell of inner radius r and outer radius 2r. This outer shell is made of a material of thermal conductivity k 2. Net conductivity would be Correct Answer k 1 + 3 k 2/4

Heat flowing per second is given by = k1 (πr2) (t1-t2) δ. Shell heat is k2 π (t1 – t2)/ δ.

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