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Which of the following circular rods (gi...

Which of the following circular rods (given radius `r` and length `l`) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

A

`r=2r_(0),l=2l_(0)`

B

`r=2r_(0),l=l_(0)`

C

`r=r_(0),l=l_(0)`

D

`r=r_(0),l=2l_(0)`

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