First slide

Conduction

Question

Two ends of rods of length L and radius r of the same material are kept at the same temperature. Which of the following rods conducts most heat ?

Moderate

A

L = 50 cm, r = 1 cm
B

L = 100 cm, r = 2 cm
C

L = 25 cm, r = 0.5 cm
D

L = 75 cm, r = 1.5-cm

Solution

Heat resistance $= \frac{l}{KA} \infty \frac{l}{A}$

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