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The surface temperatures of a flat wall are 650?C and 450?C respectively and the thermal conductivity of the wall material is 0.30 kcal/m-hr-?C. The heat flux for a wall of 20 cm thickness will be

[A].	300 kcal/m2-hr	[B].	120 kcal/m2-hr
[C].	60 kcal/m2-hr	[D].	450 kcal/m2-hr
[E].	600 kcal/m2-hr

Answer: Option A

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