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Two walls of thicknesses d 1 and d 2 and thermal conductivities k 1 and k 2 are in contact. In the steady state, if the temperatures at the outer surfaces are 1 T and 2 T , the temperature at the common wall is

1. 1 2 2 1 1 2 2 2 1 1 d k d k d T k d T k  
2. 2 1 2 2 1 1 d d d k T k  
3. 2 1 2 1 2 2 1 1 T T T T d k d k          
4. 2 2 1 1 2 2 2 1 1 1 d k d k T d k T d k  

Correct answer: 1 2 2 1 1 2 2 2 1 1 d k d k d T k d T k  

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