If Q, E and W denote respectively the heat added, change in internal energy and work done in a closed thermodynamic cycle, then:
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Question

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

G1 Physics · Accepted Answer

Step 1: A cyclic thermodynamic process returns to its initial equilibrium state. Step 2: Because internal energy U depends only on the state, the change over a cycle is ΔU = 0. Step 3: In the question the symbol E means this change, so E = 0. Step 4: From Q = ΔU + W we get Q = W for the cycle; heat and work separately need NOT vanish. Final answer: (C) E = 0.