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(D) When a rod reaches a steady state,the temperature at every point along the rod remains constant over time,meaning $\frac{dT}{dt} = 0$ for all poin

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Each point of the rod is giving heat to its neighbour at the same rate at which it is receiving heat

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(D) When a rod reaches a steady state,the temperature at every point along the rod remains constant over time,meaning $\frac{dT}{dt} = 0$ for all points.This does not mean heat flow has stopped; rather,it means that for any small cross-section of the rod,the rate of heat entering the section is exactly equal to the rate of heat leaving the section.Therefore,each point of the rod is transferring heat to its neighbor at the same rate at which it is receiving heat from the previous point.Thus,option $D$ is correct.

When two ends of a rod wrapped with cotton are maintained at different temperatures and after some time every point of the rod attains a constant temperature,then

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