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Two ends of rods of length L and radius ...

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

A

L=50 cm, R = 1 cm

B

L = 100cm, R = 2 cm

C

L = 25 cm, R = 0.5 cm

D

L = 75 cm , R = 1.5 cm

Text Solution

Verified by Experts

The correct Answer is:
B
Thermal distance `= l/(KA) = l/(K(piR^2)) prop l/R^2`
The rod for which `l/(R^2)` is minimum will conduct
maximum heat.
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