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The thermal conductivity of copper is four times that of brass. Two rods of copper and brass having the same length and cross-section are joined in series.the free end of the copper rod is at 0 degree Celsius and that of the brass rod is at 100degree Celsius the temperature of the junction of the rod in equilibrium is

The thermal conductivity of copper is four times that of brass. Two rods of copper and brass having the same length and cross-section are joined in series.the free end of the copper rod is at 0 degree Celsius and that of the brass rod is at 100degree Celsius the temperature of the junction of the rod in equilibrium is

Grade:12th pass

2 Answers

Monu
16 Points
4 years ago
Ans:Let the thermal conductivity of Cu be 4K and of Brass be K. 
Length of Copper and Brass rod ne L and their cross section area be A. 
Let the temperature at junction be T. 
By using formula:
KA(100-T) /L = 4KA(T-0) /L
100-T= 4T
5T=100
T=20°C.
 
 
Monu
16 Points
4 years ago
Thermal conductivity of brass K of copper be 4K. Lengths be L and cross section area be A. 
Let the temperature at junction be X.  
Then, KA(100-X) /L = 4KA(X-0) /L
100-X=4X
5X=100
X= 20°C

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