Consider steady-state conditions for one-dimensional conduction in a plane wall having a thermal conductivity k = 50 W/m ∙ K and a thickness L = 0.25 m, with no internal heat generation. Determine the heat flux and the unknown quantity for each case and sketch the temperature distribution. Indicating the direction of the heat flux.

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T2 T1 L. T"C) Case T;(°C) dTidx (K/nm) 50 - 20 30 - 10 70 160 40 -80 30 200