Consider a large plane wall of thickness l = 0.4 m, thermal conductivity k= 2.3 w/m x °c, and surface area a= 20 m². the left side of the wall is maintained at a constant temperature of t = 80°c while the right side loses heat by convection to the surrounding air at t¥ = 15°c with a heat transfer coefficient of h = 24 w/m² x °c. assuming constant thermal conductivity and no heat generation in the wall, (a) express the differential equation and the boundary conditions for steady one-dimensional heat conduction through the wall, (b) obtain a relation for the variation of temperature in the wall by solving the differential equation, and (c) evaluate the rate of heat transfer through the wall.