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A wall has two layers A and B made of different materials. The thickness of both layers is the same. The normal conductivity of A and Bare KA and KB such that KA= 3KB.Thetemperatureacrossthewallis20degreeC.Inthermalequilibrium

  1. thetemperaturedifferenceacrossAisl5degreeC    
  2. thetemperaturedifferenceacrossAis5degreeC    
  3. thetemperaturedifferenceacrossAisl0degreeC    
  4. therateoftransferofheatthroughAismorethanthatthroughB    

The correct answer is: therateoftransferofheatthroughAismorethanthatthroughB


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