Heat is flowing through two cylindrical ...

Heat is flowing through two cylindrical rods of the 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, then the ratio of the amounts of heat conducted through them per unit time will be:

`1:1`

`2:1`

`1:4`

`1:8`

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