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  4. A thermodynamic system is taken through the cyclic PQRSP process. The net work done by the system is

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Q. A thermodynamic system is taken through the cyclic $PQRSP$ process. The net work done by the system isPhysics Question Image

Thermodynamics

Solution:

Work done by the system $=$ area of shaded portion on $P-V$ diagram.
$=(300-100) 10^{-6} \times(200-100) \times 10^{3}=20 \, J$
And direction of process is anticlockwise so work done will be negative, i.e., $\Delta W=-20 \, J$.