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Properties of Matter question

2005 · Q165
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Properties of Matter question

2005 · Q165

NEETPhysicsProperties of MatterMCQ+4 / −1
Which of the following rods, (given radius r and length lll) each made of the same material and whose ends are maintained at the same temperature will conduct most heat ?
  1. A
    r = r0, lll = lll0
  2. B
    r = 2r0, lll = lll0
  3. C
    r = r0, lll = 2lll0
  4. D
    r = 2r0, lll = 2lll0
View written solutionFree

Correct answer: B

Heat conducted

=KA(T1−T2)tl=Kπr2(T1−T2)tl = {{KA\left( {{T_1} - {T_2}} \right)t} \over l} = {{K\pi {r^2}\left( {{T_1} - {T_2}} \right)t} \over l}=lKA(T1​−T2​)t​=lKπr2(T1​−T2​)t​

The rod with the maximum ratio of A/lll will conduct most. Here the rod with r = 2r0 and l=l0l = l_0l=l0​ will conduct most.

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