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Figure, shown three different arrangemen...

Figure, shown three different arrangements of materials 1, 2 and 3 to from a wall. Thermal conductivities are `k_(1)gtk_(2)gtk_(3)`. The left side of the wall is `20^(@)C` higher than the right side. The temperature difference `DeltaT` across the material 1 has following relation in three cases

A

In steady state, the rate of energy conduction through the wall III is greatest

B

In steady state, the rate of energy conduction though all the walls `(I),(II)` and `(III)` are same

C

In steady state, temperature difference across material l is greatest in wall `II`.

D

In steady state, temperature differnce across material l is same in all the walls

Text Solution

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The correct Answer is:
B, D
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  • A wall has two layers A and B, each made of different materials. Both the layers have the same thickness. The thermal conductivity of the material of A is twice that of B. Under thermal equilibrium , the temperature differeence across the wall is 36^(@)C . The temperature difference across the layer A is

    A
    `6^(@)C`
    B
    `12^(@)C`
    C
    `18^(@)C `
    D
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    A
    `12 .^(@)C`
    B
    `18 .^(@)C`
    C
    `6.^(@)C`
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