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  4. If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

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Q. If $Q, E$ and $W$ denote respectively the heat added, change in internal energy and the work done in a closed cycle process, then

AIPMTAIPMT 2008Thermodynamics

Solution:

Internal energy depends only on the initial and final states of temperature and not on the path. In a cyclic process, as initial and final states are the same, the internal energy change is zero.
Hence $E$ is $\Delta U$, the internal energy change