In Searle's method for finding the thermal co | vedclass

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(C) Searle's apparatus is designed to measure the thermal conductivity of a metal bar in a steady state. In the steady state,the temperature at any po

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Is the same at all points along the bar

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(C) Searle's apparatus is designed to measure the thermal conductivity of a metal bar in a steady state. In the steady state,the temperature at any point along the bar does not change with time. According to the law of heat conduction,the rate of heat flow $dQ/dt = -kA(dT/dx)$. Since the bar is thermally insulated along its length,the heat flow rate is constant throughout the bar. Because the cross-sectional area $A$ and thermal conductivity $k$ are constant,the temperature gradient $dT/dx$ must also be constant at all points along the bar.

In Searle's method for finding the thermal conductivity of metals,the temperature gradient along the bar:

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