Question

Correct statement about 'heat' and 'work' is that
(1) Heat appears at surface only and work in bulk
(2) Heat appears in bulk and work only at surface
(3) Both heat and work appear in bulk of system
(4) Both heat and work appear on surface only​

Answer 1

Ans - 4th Option

Explanation:

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Answer 2

Ans 1. Heat and work appears on the surface only:

Now the copper wires in the insulation don't get heated as of temperature difference of copper and air. That is the consequence of work done by electrical energy contrary to the resistance force of copper.

Ans 2.

Heat and work appears on the surface only:

That is the consequence of work done by electrical energy contrary to the resistance force of copper. ... This example shows that heat and work are experienced while crossing the boundaries or transitions.

Ans 4. Hello Akshay

Suppose you have 2 metal cubes & provided one with 100 kJ & other with 200 kJ heat. Now both are at different temperatures.

There’s nothing like heat content or work content of system. Whatever heat we provided, which is one form of energy.. now it is the internal energy of that system.

The heat transfer (significantly) would take place only when these cubes are brought in contact with each other i.e., heat transfer is experienced while crossing the boundary of that particular system.

Now, consider electrical wiring in your house. The thickness of insulation provided plays crucial role for dissipation of heat generated.

Here the copper wires under the insulation doesn’t get heated because of temperature difference of copper and air. That is the result of work done by electrical energy against the resistance force of copper.

So, this is actually work done but we experience that as another form of energy which is heat and that too when it crosses the boundary of system i.e., the layer of insulation.

From above 2 examples we see that heat and work are experienced while in transition or while crossing boundaries.

What are boundaries… surfaces that we see. I tried my best.. ask any doubts.

I hope you got this….