1.

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

A. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/716-132-1.png">
B. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/716-132-2.png">
C. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/716-132-3.png">
D. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/716-132-4.png">
Answer» C. <img src="/_files/images/chemical-engineering/chemical-engineering-basics/716-132-3.png">


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