Relation between shape factor - Heat Transfer

Q.  When F12 is the shape factor of A1with respect to A2 and F21 is the shape factor of A2 with respect to A1and A1= A2, then what is the relation between F12 and  F21?
- Published on 12 Aug 15

a. F12 > F21
b. F12 < F21
c. F12 = F21
d. none of the above

ANSWER: F12 = F21

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