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If the temperature difference on the two sides of a wall increases from `100^@C` to `200^@C`, its thermal conductivity

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If the temperature difference on the two sides of a wall increases from `100^@C` to `200^@C`, its thermal conductivity
A. remains unchanged
B. is doubled
C. is halved
D. become four times
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Correct Answer - A
Thermal conductivity is indepedent of temperatures of the wall, it is constant for the material, so it will remain unchanged.
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