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Two cylindrical rods of the same materia...

Two cylindrical rods of the same material have the same temperature difference between their ends. The ratio of the rates of flow of heat through them is 1 : 8. The radii of the rods are in the ratio 1 : 2. What is the ratio of their lengths ?

A

`2:1`

B

`4:1`

C

`1:8`

D

`1:32`

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The correct Answer is:
A
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