Multiple choice

The quantity of heat which crosses unit area of a metal plate during conduction depends upon

  1. the density of the metal

  2. the temperature gradient perpendicular to the area

  3. the temperature up to which the metal is heated

  4. the area of the metal plate
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B Correct answer
Explanation

According to Fourier's Law of heat conduction, the rate of heat transfer per unit area (heat flux) is proportional to the temperature gradient (dT/dx). The temperature gradient represents the change in temperature over a distance perpendicular to the area.

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