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The coefficient of thermal conductivity ...

The coefficient of thermal conductivity of copper is nine times of steel in the composite cylindrical bar shown in the figure. What is the temperature at the junction of copper & steel?

A

`61^(@)C`

B

`62^(@)C`

C

`65^(@)C`

D

`66^(@)C`

Text Solution

Verified by Experts

The correct Answer is:
C
According to the relation `T=(K_(1)T_(1)l_(2)+K_(2)T_(2)l_(1))/(K_(1)l_(2)+K_(2)l_(1)`)
`T=(9Kxx80xx10+Kxx0+20)/(9Kxx10+Kxx20)=(9Kxx800)/(90K+20K)`
`=(9Kxx800)/(110K)`
`T=65.4^(@)C`
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