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 rad

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.	(r₂ . r₁)/(r₂ - r₁)
C.	(r₁ + r₂)/(r₁ . r₂)
D.	(r₁ . r₂)/(r₁ + r₂)
Answer» C. (r₁ + r₂)/(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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