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10.2 , transmission of heat — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics10.2 , transmission of heat1 Mark
MCQ
Which of the following circular rods. (given radius $ r$ and length $l$ ) each made of the same material as whose ends are maintained at the same temperature will conduct most heat
  • A
    $r = 2{r_0};\;l = 2{l_0}$
  • ✓
    $r = 2{r_0};\;l = {l_0}$
  • C
    $r = {r_0};\;l = {l_0}$
  • D
    $r = {r_0};\;l = 2{l_0}$
✓

Answer

Correct option: B.
$r = 2{r_0};\;l = {l_0}$
b
(b) $\frac{Q}{t} \propto \frac{{{r^2}}}{l}$; from the given options, option $(b)$ has higher value of $\frac{{{r^2}}}{l}$

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