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(D) The rate of heat flow is given by $\frac{dQ}{dt} = -KA \frac{d	heta}{dx}$.For the temperature of the whole rod to be uniform,the temperature grad

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$K=\infty$

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(D) The rate of heat flow is given by $\frac{dQ}{dt} = -KA \frac{d	heta}{dx}$.For the temperature of the whole rod to be uniform,the temperature gradient $\frac{d	heta}{dx}$ must be zero.From the equation,if $K = \infty$,then $\frac{d	heta}{dx} = \frac{dQ/dt}{-K \cdot A} = 0$.Therefore,when $K = \infty$,the temperature $	heta$ becomes independent of the position $x$,meaning the temperature is uniform throughout the rod.

On heating one end of a rod,the temperature of the whole rod will be uniform when

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