Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?

Heat flow across a hollow sphere of inner radius ‘r1’ and outer ra

1.	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)
Answer» C. (r2 + r1)/r1. r2

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Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?

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