2. Heat is transferred steadily in one direction in a composite plane wall that is made of two materials. Material A has a conductivity of kA=10W/m.K and material B has a conductivity of kB=1W/m.K. The thickness of both materials in the x-direction is L=10cm and the cross sectional area is 1m2. The left side of the material A is maintained at TH=300K and the right hand side of material B is held at Ts=100K. (a) Determine the rate of heat transfer in the system and (b) the temperature at the contact between material A and B