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Which of the following circular rods (given radius r and length l), each made of the same materia and whose ends are maintained at the same temperature will conduct most heat? (a) r = r0; l=l0 (b) r = 2r0; l=l_0 (c) r = r0; l=2l_0

Which of the following circular rods (given radius r and length l), each made of the same materia and whose ends are maintained at the same temperature will conduct most heat?
    (a)     r = r0; l=l0
    (b)    r = 2r0; l=l_0 
    (c)    r = r0; l=2l_0

Grade:11

1 Answers

Amit Saxena
35 Points
7 years ago

It is clear that for option (2) resistance is minimum, hence, heat flow will be maximum

[Alt :

(i)     Rate of heat flow is directly proportiona to area

(ii)    Inversely proportional to length.

:. Heat flow will be maximum when r is maximum and l is minimum.

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