AIPMT PRELIMS 2005 Physics Conduction MCQ Question
Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?
r = 2r₀; l = 2l₀
r = 2r₀; l = l₀
r = r₀; l = l₀
r = r₀; l = 2l₀
Correct Answer
Detailed Explanation
The heat conducted is proportional to the cross-sectional area and inversely proportional to the length. Increasing the radius increases the area, thus increasing heat conduction.
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