Four rods of same material with different radii \( r \) and length ...

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Four rods of same material with different radii \( r \) and length \( l \) are used to connect two reservoirs of heat at different
WV temperatures. Which one will conduct most heat?
(a) \( \mathrm{r}=2 \mathrm{~cm}, l=0.5 \mathrm{~m} \)
(b) \( \mathrm{r}=2 \mathrm{~cm}, l=2 \mathrm{~m} \)
(c) \( \mathrm{r}=0.5 \mathrm{~cm}, l=0.5 \mathrm{~m} \)
(d) \( \mathrm{r}=1 \mathrm{~cm}, l=1 \mathrm{~m} \)
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