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Question
A sphere of radius 'R₁' is enclosed in a sphere of radius 'R₂'. The view (or shape) factor for radiative heat transfer of the outer sphere with respect to the inner sphere is
Options:
A .  0
B .  R₂/(R₁+R₂)
C .  1
D .  (R₁/R₂)2
Answer: Option B

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