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A long metallic bar is carrying heat fro...

A long metallic bar is carrying heat from one its ends to the other end under steady-state. The variation of temperature `theta` along the length x of the bar from its end is best described by which of the following figure.

A

B

C

D

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The correct Answer is:
D
In steady state, temperature decreases linearly along the bar. i.e `(dQ)/(dt)= -KA(d theta)/("dx")`
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