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(C) In a $PV$ diagram,the work done by a thermodynamic system during a process is equal to the area under the curve.For a complete cyclic process,the

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$ACBDA$

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(C) In a $PV$ diagram,the work done by a thermodynamic system during a process is equal to the area under the curve.For a complete cyclic process,the net work done is equal to the area enclosed by the closed loop of the $PV$ diagram.In the given diagram,the system follows the path $A \rightarrow C \rightarrow B$ and then returns to $A$ via $B \rightarrow D \rightarrow A$.The closed loop formed by these paths is $ACBDA$.Therefore,the net work done during the complete cycle is given by the area enclosed by the loop $ACBDA$.

$A$ thermodynamic system is taken from state $A$ to $B$ along $ACB$ and is brought back to $A$ along $BDA$ as shown in the $PV$ diagram. The net work done during the complete cycle is given by the area

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