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Four rods of same material but different radii r and length l are used to connect two reservoirs of heat at different temperatures the one which will conduct most heat is |
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Answer» t conduction per UNIT time is given by,dq/dt = k(t₁ - t₂)A/L=> dq/dt = k(t₁ - t₂)πr²/l=> dq/dt ∝ r²/lhence we can see that the heat conduction is directly PROPORTIONAL to the RADIUS and INVERSELY proportional to the length.So heat conduction is maximum when r is maximum and l is minimum.Hence the rod with maximum radius and minimum length will conduct maximum heat. |
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