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Four rods, of different radii r and leng...

Four rods, of different radii r and length l, are used to connect two reservoirs of heat at different temperatures. The rod that will conduct the heat fastest will be

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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