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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
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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