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Question
Figure shows a copper rod joined to a steel rod. The rods have equal length and equal cross sectional area.The free and of the copper rod is kept at 0∘C and that of the steeel rod is kept at 100∘C. Find the temperature at the junction of the rods. Conductivity of copper = 390W/m∘C and that of steel = 46W/m∘C
Figure shows a copper rod joined to a steel rod. The rods have equal length and equal cross sectional area.The free and of the copper rod is kept at 0∘C and that of the steeel rod is kept at 100∘C. Find the temperature at the junction of the rods. Conductivity of copper = 390W/m∘C and that of steel = 46W/m∘C
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Solution
The correct option is B 10.6∘C
Answer is Blet the length be L and the temperature be T of junctionfor Steelq=−K1A(T−100)L ......1 For copperq=−K2A(0−T)L ......2
from 1 and 2T=10.6oC
Answer is B
let the length be L and the temperature be T of junction
for Steel
q=−K1A(T−100)L ......1
For copper
q=−K2A(0−T)L ......2
from 1 and 2
T=10.6oC
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