question_answer

Which of the following circular rods, (given radius r and length /) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

A) \[\operatorname{r}=2{{r}_{0}};l=2{{l}_{0}}\]    

B) \[\operatorname{r}=2{{r}_{0}};l={{l}_{0}}\]

C) \[\operatorname{r}={{r}_{0}};1=2{{1}_{0}}\]   

D)   \[\operatorname{r}={{r}_{0}};1={{1}_{0}}\]