# A hollow tube has a length l, inner radius R_(1) and outer radius R_(2) . The material has a thermal conductivity K. Find the heat flowing thr

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A hollow tube has a length l, inner radius R_(1) and outer radius R_(2) . The material has a thermal conductivity K. Find the heat flowing through the walls of the tube if
(a) the flat ends are maintained at temperature T_(1) and T_(2)(T_(2)gtT_(1))
(b) the inside of the tube is maintained at temperature T_(1) and the outside is maintained at T_(2) .

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Correct Answer - (Kpi(R_(2)^(2)-R_(1)^(2))(T_(2)-T_(1)))/(I)
(dQ)/(dt) = KA ((T_(2)-T_(1))/(l))
Here A = pi (R_(2)^(2) -R_(1)^(2))