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

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Four rods of same material with different radii \( r \) and
\( \mathrm{P} \) length \( l \) are used to connect two reservoirs of heat at
\( \mathrm{W} \) different temperatures. Which one will conduct maximum heat?
(1) \( r=1 \mathrm{~cm}, l=1 \mathrm{~m} \)
(2) \( r=2 \mathrm{~cm}, l=2 \mathrm{~m} \)
(3) \( r=1 \mathrm{~cm}, l=1 / 2 \mathrm{~m} \)
(4) \( r=2 \mathrm{~cm}, l=1 / 2 \mathrm{~m} \)
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