Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?
(A) (r2 – r1)/r1. r2
(B) r1. r2/(r2 – r1)
(C) (r2 + r1)/r1. r2
(D) r1. r2/(r2 + r1)
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