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Two conductor of the same material have ...

Two conductor of the same material have their diameter in the ratio `1 : 2` and their lengths in the ratio `2 : 1`. If the temperature difference between their ends is the same, then the ratio of amounts of best conducted per second through them will be

A

`4 : 1`

B

`1 : 4`

C

`8 : 1`

D

`1 : 8`.

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