The internal energy when a system goes from state A to B is 40 kJ. If the system goes from A to B by a reversible path and returns to state A by an irreversible path. What would be the net change in internal energy?
A
40 kJ
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B
> 40 kJ
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C
< 40 kJ
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D
zero
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Solution
The correct option is D zero In a cyclic process △U=0 since internal energy is state function.