Question 392: Properties of Matter

Question

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 ?

Accepted Answer

Heat conducted
$$ = {{KA\left( {{T_1} - {T_2}} \right)t} \over l} = {{K\pi {r^2}\left( {{T_1} - {T_2}} \right)t} \over l}$$
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.

Answer

r = r
0
,    $$l$$ = $$l$$
0

Answer

r = 2r
0
,    $$l$$ = $$l$$
0

Answer

r = r
0
,    $$l$$ = 2$$l$$
0

Answer

r = 2r
0
,    $$l$$ = 2$$l$$
0

Properties of Matter

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 ?

Choose the correct answer: