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  • The ratio of coefficient of thermal conductivity of two different material is 5:3 . If the thermal resistance of the rods of same thickness of these material is same , then the ratio of the length

The ratio of coefficient of thermal conductivity of two different material is 5:3 . If the thermal resistance of the rods of same thickness of these material is same , then the ratio of the length of these rods will be

Option: 1

3:5 


Option: 2

5 : 3 


Option: 3

3 : 4 


Option: 4

3 : 2 


Answers (1)

best_answer

As we have learned

Thermal Resistance -

R_{th}=\frac{l}{KA}

- wherein

Length of conductor -l 

Area of cross section - A

Thermal Conductivity - K

 R= L/KA

R_ 1= R_ 2 \Rightarrow \frac{L_1}{K_1A_1}= \frac{L_2}{K_2A_2}

\frac{L_1}{L_2}= \frac{K_1A_1}{K_2A_2}= \frac{K_1}{K_2} = 5/3

Posted by

Ritika Jonwal

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