If two ends of rods of length L and radius r, made up of same material are kept at the same temperature difference, which of the following rods conduct most heat per unit time?

If two ends of rods of length L and radius r, made up of same material

1.	If two ends of rods of length L and radius r, made up of same material are kept at the same temperature difference, which of the following rods conduct most heat per unit time?
A.	L = 50 cm, r = 1 cm
B.	L = 2 cm, r = 0.5 cm
C.	L = 100 cm, r = 2 cm
D.	L = 3 cm, r = 1 cm
Answer» E.

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If two ends of rods of length L and radius r, made up of same material are kept at the same temperature difference, which of the following rods conduct most heat per unit time?

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