Transmission Of Heat Question 87
Question: 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
[CBSE PMT 2005]
Options:
A) $ r=2r _{0};\ l=2l _{0} $
B) $ r=2r _{0};\ l=l _{0} $
C) $ r=r _{0};\ l=l _{0} $
D) $ r=r _{0};\ l=2l _{0} $
Show Answer
Answer:
Correct Answer: B
Solution:
$ \frac{Q}{t}\propto \frac{r^{2}}{l} $ ; from the given options, option (b) has higher value of $ \frac{r^{2}}{l} $ .
BETA
