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The ends of a metallic bar are maintaine...

The ends of a metallic bar are maintained at different temperature and there is no loss/gain of heat from the sides of the bar due to conduction or radiation. In the steady state the temperature variation along the length of the bar is a shown in the figure what do you think about the cross sectional area of the bar?

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cross esctional area of the bar decreases from hot end to the cold end
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