Relation between two bodies for reciprocating theorem - Heat Transfer

Q.  When two bodies of areas A1and A2 are exchanging radiant heat energy, F12 is the shape factor of A1with respect to A2 and F21 is the shape factor of A2 with respect to A1, then what is the correct relation for reciprocating theorem? Assuming A1> A2
- Published on 12 Aug 15

a. A1F12 > A2 F21
b. A1F12 < A2 F21
c. A1F12 = A2 F21
d. none of the above

ANSWER: A1F12 = A2 F21

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