Question

what happens to thermal conductivity of a wall if its thickness is doubled
becomes double
becomes haif
becomes one fourth
remain same

Answer 1

i) thickness becomes double

The resistance of the conductor is inversely purpotional to the area of cross-section or thickness. Therefore, Resistance will decrease and will become half of the previous value.

ii) thickness becomes half

Since, Resistance is inversely purpotional to the area of cross-section or thickness. Therefore, Resistance will increase by half of the initial value.

iii) thickness becomes one fourth

Resistance is inversely purpotional to the area of cross-section or thickness. Then decreasing thickness by one fourth will increase the resistance four times.

iv) thickness remains same

Nothing would happen.