ISRO Scientist or Engineer Refrigeration & Air-Conditioning 2013 Question 71

Question 71

If the inner and outer walls of a hollow sphere having surface areas of $$A_1$$ and $$A_2$$ and inner and outer radii $$r_1$$ and $$r_2$$ are Maintained at temperatures $$t_1$$ and $$t_2$$, then rate of heat flow will be



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