Which of the following options is incorrect in reference to Fourier's law of heat conduction?

Rate of heat flow is proportional to the cross-sectional area of rod

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Rate of heat flow is proportional is the temperature difference between the ends of the rod

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Rate of heat flow is inversely proportional to thickness of the rod

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Rate of heat flow is proportional to the coefficient of thermal conductivity of material of the rod

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Solution

The correct option is D Rate of heat flow is proportional to the coefficient of thermal conductivity of material of the rod
According to Fourier's law of heat conduction, rate of heat flow is proportional to cross sectional area of the rod, temperature difference between the ends of the rod and inversely proportional to the thickness of the rod. Thermal conductivity is the proportionality constant, which depends upon the nature of the material the rod is made up of.

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Conduction Law

Standard XII Physics

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