A solid sphere of radius r1 = 20 mm is placed concentrically inside a – McqOptions

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1.	A solid sphere of radius r1 = 20 mm is placed concentrically inside a hollow sphere of radius r2 = 30 mm as shown in figure.The view factor F21 for radiation heat transfer is
A.	2/3
B.	4/9
C.	8/27
D.	9/4
Answer» C. 8/27

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