Explanation:
https://www.chegg.com/homework-help/questions-and-answers/iron-core-wish-design-transformer-part-dc-power-supply-moderately-high-current-rating-volt-q53186459?trackid=83dbc34cec2e&strackid=3efc9f324415
To develop this problem it is necessary to apply the definitions of entropy change within the bodies
The change of entropy in copper would be defined as

Where,
Q= Heat exchange
T = Temperature
For an incompressible substance, the change in the heat exchange is defined as

Where,
m = Mass
c = Specific heat
Replacing in our equation we have that


Since
, then


In this way for the change of enthalpy and internal energy you have to

As
, then

Therefore the correct option is A. No change at All
Answer:0.646 KJ
Explanation:
Using First law for cycle


For adiabatic process heat transfer is zero and for isothermal process
d(Q)=d(W)

Given 

=

=

=
Now we have to find 
=


