Verified Solution • 2025–26 Session moderate

QAIPMT-2005-Ph-2551: NEET 2005 Physics - Class 11 AIPMT-2005-Ph-2551 Solution: Which of the following rods, (given radius r and length l) each …

Which of the following 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?

Multiple Choice Options

A $r=r_0$ , $l=l_0$
B $r=2r_0$ , $l=l_0$
C $r=r_0$ , $l=2l_0$
D $r=2r_0$ , $l=2l_0$

Step-by-Step Verified Solution

Heat conducted = K A ( T 1 _ T 2 ) t l = K � r 2 ( T 1 _ T 2 ) t l The rod with the maximum ratio of A/ l will conduct most. Here the rod with r = 2r 0 and l = l 0 will conduct most.

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