- Two barg 1 and Beach length 2. Om and cross- sectional area ). Om?, are placed end toend . The thermal conductivityes of the bars are KA= 439 J/(s .mik ) and KB = 8 87 J/(s.m.k ) The left end of the bat A is maintained at 373 15 While the right end of B is maintained at 27319 a ). What is the temperature at the interface between A and B ? b ) . what 's the rate of heat transfer through this combination ? ( ). How much heat passes the interface between A and B in bos