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Which of the following circular rods (gi...

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

A

`r=2r_0, x=2x_0`

B

`r=2r_0, x=x_0`

C

`r=r_0, x=x_0`

D

`r=r_0, x=2x_0`

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