The coefficient of thermal conductivity of copper is 9 times that of steel. In the composite cylindrical bar shown in the figure. What will be the temperature at the junction of the copper and steel.

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75oC

67oC

33oC

25oC

answer is A.

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Detailed Solution

Rate of heat flow far both the rods are same.Qt=KAθ1-θ2l=constant9K100-θ18=Kθ-06300-3θ=θθ=75oC

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