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Q.

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 ?

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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

answer is B.

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Detailed Solution

Heat resistance =lKA∞lA
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