The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar shown in figure, what will be the temperature at the junction ofcopper and steel?
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a
75∘C
b
67∘C
c
33∘C
d
25∘C
answer is A.
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Detailed Solution
K1=9K2,l1=18cm,l2=6cm,θ1=100 o C,θ2=0C Temperature of the junction θ=K1l1θ1+K2l2θ2K1l1+K2l2⇒ θ=9K218100+K26×09K218+K26=50+08/12=75∘C
The coefficient of thermal conductivity of copper is nine times that of steel. In the composite cylindrical bar shown in figure, what will be the temperature at the junction ofcopper and steel?