This question concerns a fundamental theorem in radiative heat transfer, specifically the Reciprocity theorem related to view factors (shape factors).
For estimating the shape factor in radiative heat transfer, the Reciprocity theorem states - - (4) $\epsilon_{1}$ F$_{1-2}$ = $\epsilon_{2}$ F$_{2-1}$ - (5) Question not attempted
Asked in Assistant Eng. (Mechanical) Competitive Examination, 2023 · Topic: Heat and Thermodynamics (Blackbody Radiation and Laws (Stefan-Boltzmann, Wien's Displacement))
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Answer: B. (2) A$_{1}$ F$_{1-2}$ = A$_{2}$ F$_{2-1}$
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