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Application of Trapped Air as Insulator

6 MinsPhysics
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REVISE WITH CONCEPTS

Applications of Thermal Conductivity

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Applications of Conductors and Insulators

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Application of Trapped Air as Insulator

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Important Questions

A wall has two layers and , each made of different materials. Both the layers have the same thickness. The thermal conductivity of the material of is twice that of . Under thermal equilibrium, the temperature difference across the wall is . The temperature difference across the layer is

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Two rods and of different materials are welded together as shown in figure. Their thermal conductivities are and . The thermal conductivity of the composite rod will be : 

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Consider a compound slab consisting of two different materials having equal lengths, thicknesses and thermal conductivities and respectively. The equivalent thermal conductivity of the slab is

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The dimensional formula for coefficient of thermal conductivity is:

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The temperature of the two outer surfaces of a composite slab, consisting of two materials having coefficients of thermal conductivity and  and thickness and , respectively are and . The rate of heat transfer through the slab, in a steady state is  with equals to

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Three identical thermal conductors are connected as shown in figure. Considering no heat loss due to radiation, temperature at the junction will be

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A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities and . The equivalent thermal conductivity of the slab is :

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Two rods of same length and material transfer a given amount of heat in seconds , when they are joined in parallel. But when they are joined in series , then they will transfer same heat in same condition in 

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Which of the following are conductors and which are insulators ?
Sulphur , Silver , Copper , Cotton , Aluminium , Air , Nichrome , Graphite , Paper , Porcelain , Mercury, Mica , Bakelite , Polythene , Manganin.

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The coefficient of thermal conductivity of copper is times that of steel. In the composite cylindrical bar shown in the figure, what will be the temperature at the junction of copper and steel?

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