A hollow tube has a length l, inner radius R 1 and outer radius R 2 . The material has thermal conductivity K. Find rate of heat flowing through the walls of the tube if the flat ends are maintained at temperatures T 1 and T 2 (T 2 > T 1 ).
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When the flat ends are maintained at temperatures 
and 
(where 
):
Area of cross section through which heat is flowing, 
Rate of flow of heat 
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