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A gas is taken through the cycle A → B → C → A, as shown in figure. What is the net work done by the gas?

1. 2PV
2. 4PV
3. 1/2 PV
4. PV

Correct answer: 4PV

Solution

The net work done by the gas in a cyclic process is equal to the area enclosed by the cycle on the PV diagram. The given cycle forms a rectangle with an area of 4PV, hence the net work done is 4PV.

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