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Four rods of same material with differen...

 Four rods of same material with different radii r and length l are used to connect two reservoirs of heat at different temperatures. Which one will conduct maximum heat?

A

r=1 cm, l=1 m

B

r=2 cm,l=2 m

C

r=1 cm,l=1/2 m

D

r=2 cm,l=1/2 m

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