Which of following cylindrical rods will coduct most heat when their ends are maintained at same ste

English

Gujarati

Hindi

10-2.Transmission of Heat

normal

Which of the following cylindrical rods will coduct most heat when their ends are maintained at the same steady temperatures?

A

Length $1\,m$, radius $1\,cm$

B

Length $1\,m$, radius $2\,cm$

C

Length $2\,m$, radius $1\,cm$

D

Length $2\,m$, radius $2\,cm$

Solution

$\theta=\frac{K_{1} \theta_{1}+K_{2} \theta_{2}}{K_{1}+K_{2}} \mathrm{P} \frac{K_{1}}{K_{2}}=\frac{5}{3} K_{1}=5 K K_{2}=3 K$

is maximum in option (b), hence it will conduct more heat.

Standard 11

Physics

Share

Similar Questions

Which of the following material is most suitable for cooking utensil?

normal

The plots of intensity versus wavelength for three black bodies at temperature $T_1$, $T_2$ and $T_3$ respectively are as shown. Their temperatures are such that

normal

A wall has two layers $A$ and $B$ , each made of a different material. Both the layers have the same thickness. The thermal conductivity of the material of $A$ is twice that of $B$ . Under thermal equilibrium, the temperature difference across the wall is $36\,^oC$. The temperature difference across the layer $A$ is ……… $^oC$

normal

If the temperature of a black body increases from $7\,^oC$ to $287\,^oC$ then the rate of energy radiation increases by

normal

It takes $10$ minutes to cool a liquid from $61^{\circ} C$ to $59^{\circ} C$. If room temperature is $30^{\circ} C$ then time taken in cooling from $51^{\circ} C$ to $49^{\circ} C$ is ………. $min$

normal