Four rods of same material with different radii r and length

Last updated: 6/9/2023

Four rods of same material with different radii r and length 1 are used to connect two heat reservoirs at different temperatures In which of following case heat conduction is fastest 1 1 1 r cm 1 cm 2 r 3cm 1 9cm 3 r 4cm 1 8cm 4 r 1cm 11cm