The ratio of thermal conductivities of two rods of different material is 5 : 4. The two rods have same area of cross-section and same thermal resistance. They will have the lengths in the ratio
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a
4 : 5
b
9 : 1
c
1 : 9
d
5 : 4
answer is D.
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Detailed Solution
thermal resistance = lKAgiven l1K1A=l2K2A then l1l2=K1K2=54
The ratio of thermal conductivities of two rods of different material is 5 : 4. The two rods have same area of cross-section and same thermal resistance. They will have the lengths in the ratio