According to Fourier’s law, amount of heat flow (Q) through the body in unit time is equal to

1
\(kA\frac{{dT}}{{dx}}\)
2
\(kA\frac{{d{T^2}}}{{d{x^2}}}\)
3
\(k\frac{{dx}}{{dT}}\)
4
\(kA\frac{{dx}}{{dT}}\)

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