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Question

The ratio of thermal conductivity of two rods of different material is 5 : 4. The two rods of same area of cross-section and same thermal resistance will have the lengths in the ratio


  1. 4 : 5

  2. 9 : 1

  3. 1 : 9

  4. 5 : 4


Solution

The correct option is D

5 : 4


Given A1=A2 and K1K2=54 

R1=R2l1K1A=l2K2Al1l2=K1K2=54 .

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