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Question

The coefficient of thermal conductivity of copper, mercury and glass are respectively KC,Km and Kg such that Kc>Km>Kg. If the same quantity of heat is to flow per second per unit area of each and corresponding temperature gradients are XC,Xm and Xg, then

A
Xc=Xm=Xg
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B
Xc>Xm>Xg
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C
Xc<Xm<Xg
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D
Xm<Xc<Xg
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Solution

The correct option is C Xc<Xm<Xg
We know that, rate of heat transfer
q=KAdTdx

Given that, qA=constant
Temperature gradient dTdx1K
Since, Kc>Km>Kg we can interpret that Xc<Xm<Xg

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