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
AIPMT 2005, Easy
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(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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