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Two rods A and B are of equal lengths. Their ends are kept between the same temperature and their area of cross- sections are 1 A and 2 A and thermal conductivities 1 K and 2 K . The rate of heat transmission in the two rods will be equal, if

1. 1 2 2 1 A K A K 
2. 2 2 1 1 A K A K 
3. 2 1 K K 
4. 2 2 2 2 1 1 A K A K 

Correct answer: 2 2 1 1 A K A K 

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