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Under Fourier's law of heat conduction, what does the negative sign in the equation q = -k A (dT/dx) physically represent?

That thermal conductivity decreases with temperature That heat flows in the direction of decreasing temperature (from hot to cold) That the temperature gradient is always positive That the rate of heat transfer is negative in a steady state

Correct Answer:

That heat flows in the direction of decreasing temperature (from hot to cold)

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