The heat is flowing through two cylindri...

The heat is flowing through two cylindrical rods of same material. The diameters of the rods are in the ratio `1:2` and their lengths are in the ratio `2:1`. If the temperature difference between their ends is the same, the ratio of rates of flow of heat through them will be

` 1 : 1`

`2 : 1`

`1 : 4`

`1 : 8`

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