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A long, uniform metallic bar is carrying heat from one of its ends to the other end under steady-state. The variation of temperature $θ$ along the length x of the bar from its hot end is best described by which of the following graphs?

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answer is B.

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Detailed Solution

By law of heat conduction, $\frac{d Q}{d t} = K A \frac{d θ}{d x}$

In steady state, temperature gradient in a uniform bar is constant. So slope of $θ - x$ graph is constant.

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