2. Consider a large plane wall of thickness Z = 0.2 m, thermal conductivity k = 1.2 W/m-K, and surface area 4 = 15 m². The two sides of the wall are maintained at constant temperatures of T₁ = 120°C and T₁ = 50°C, respectively, as shown below. Determine (a) the variation of temperature within the wall and the value of temperature at x = 0.1 m and (b) the rate of heat conduction through the wall under steady conditions. (10pt) T₁ 0 Plane wall T₂