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The ends of a well-lagged copper bar of length L are held at steady temperatures $θ_{1}$ and $θ_{2} (θ_{1} > θ_{2})$
Which graph best represents the relationship between dQ /dt, the rate of flow of heat, and x, the distance, from the hot end when all temperatures in the bar are steady?

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answer is D.

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Detailed Solution

In the steady state, temperature of each point remains unchanged, different points along the length are at different temperature, temperature gradient along the length is uniform. Rate of heat conducted is constant.

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