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Q.

The coefficients of thermal conductivity of copper, mercury and glass are Kc,Km and Kg, respectively, 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 respectively, then

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a

Xc=Xm=Xg

b

Xc>Xm>Xg

c

Xc

d

Xm

answer is C.

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Detailed Solution

dQ/dtA=KΔθΔx⇒ Rate of flow of heat per unit area= Thermal conductivity x Temperature gradient Temperature gradient (X)∝1 Thermal conductivity (K)   (As dQ/dtA= constant) As KC>Km>Kg, therefore Xc
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