3. Consider a large plane wall of thickness L = 0.2 m, thermal conductivity k = 1.2 W/m.°C, and the surface area A = 15 m². The two sides of the wall are maintained at constant temperatures of T, = 120°C and T2 = 50°C, respectively, as shown in the figure. Plane wall Determine (a) The variation of temperature within the wall in symbolic equation (don't substitute the numbers). State your assumptions. (b) Sketch the temperature profile in the wall (c) The value of temperature at x = 0.1 m and x = 0.15 m. (d) The rate of heat transfer through the wall at steady conditions at x=0.1 m and x = 0.15 m. (e) The heat flux at x = 0.1 m and x = 0.15 m. (f) Repeat part a and b with heat generated within the wall is considered. (g) Comment on the difference in the values will be obtained for the heat rate and flux compared to those obtained in part d and e. Justify your answer.