Question

When heat flows through a wire of uniform cross section, under steady state :

• A. temperature gradient is same every where
• B. temperature at a particular point remains same
• C. rate of heat flow is same at all cross sections
• D. all of the above

Answer 1

Answer: (D)

all of the above

In steady state, heat received by any small element $=$ heat given by it
So, heat is partially radiated and no net heat is absorbed.
We give an argument for this.
Suppose that the heat is being given out by the element.
In this case, the element's temperature will decrease.
But, by definition , at steady state, all the temperatures remain constant.
So, this will violate the steady state condition.