A cylinder of radius r and made of material of thermal conductivity k 1 is surro

Question

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

Options:

A . k 1 + 3 k 2/4

B . k 1 + k 2/4

C . k 1 + 3k 2

D . k 1 + k 2

Answer: Option A
Answer: (a).k 1 + 3 k 2/4

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