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The two ends of a metal rod are maintain...

The two ends of a metal rod are maintained at temperatures `100^(@)C` and `110^(@)C` . The rate of heat flow in the rod is found to be `4.0 j//s`. If the ends are maintaind at temperatures `200^(@)C` and `210^(@)C`, the rate of heat flow will be :

A

`16.8 J//s`

B

`8.0 J//s`

C

`4.0 J//s`

D

`44.0 J//s`

Text Solution

Verified by Experts

The correct Answer is:
C
`(DeltaQ)/(Deltat)=(KADeltaT)/(l)`
`4J//s=(KA[110-100])/(l) DeltaT=110-100=10^(@)C`
Similarly for
`DeltaT=210-200=10^(@)C`
`(DeltaQ)/(Deltat)=(kA[210-200])/(l)rArr(DeltaQ)/(Deltat)=4J//s`
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