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The wall of a house is made of two different materials of same thickness. The temperature of the outer wall is T2 and that of inner wall is T1 < T2 . The temperature variation inside the wall as shown in the figure. Then :

(A) thermal conductivity of inner wall is greater than that of outer. 

(B) thermal conductivity of outer wall is greater than that of inner 

(C) thermal conductivities of the two are equal 

(D) no conclusion can be drawn about thermal conductivities

1 Answer

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Correct option (B) thermal conductivity of outer wall is greater than that of inner


The slope of temperature variation is more in inner
Larger the conductivity, smaller is the slope. 
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