A two-layer composite plane wall is made of materials A and B, from left to right, with ka = 300 W/m-K, kg = 100 W/m-K, LA = 30 mm and LB = 10 mm. The left surface of the composite wall is adiabatic while the right surface is exposed to cooling air at 300 K. The thermal contact resistance at the interface of materials A and B is 102 m²K/W and a 10°C temperature drop is measured at this interface. a. Sketch the composite wall assembly, and draw the corresponding equivalent thermal circuit. b. Plot the temperature variation throughout the composite wall and wall-air interface. c. If the maximum allowable temperature throughout the assembly is 400 K, what should be the minimum heat transfer coefficient associated with convection on the right surface?