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A system is taken round a cycle and returns to its starting state. The change in its internal energy over that loop is:
ANegative still
BQuite endless
CExactly zero
DPositive still
Answer & Solution
Correct answer: C. Exactly zero
1. Internal energy depends only on the state.
2. The final state is identical to the initial one.
3. So the change round a closed path is exactly zero.
_Source: OpenStax University Physics Volume 2, Chapter 3, The First Law of Thermodynamics._
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