Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to

Question

A. (r₂ - r₁)/r₁. r₂

B. r₁. r₂/(r₂- r₁)

C. (r₂ + r₁)/r₁. r₂

D. r₁. r₂/(r₂ + r₁)

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Accepted Answer

B. r₁. r₂/(r₂- r₁)

Heat flow across a hollow sphere of inner radius 'r1' and outer radius 'r2' is directly proportional to