Q. A thermodynamic system is taken through the cycle $PQRSP$ process. The net work done by the system is
A) $20\ J$
B) $- 20\ J$
C) $400\ J$
D) $- 374\ J$
Explanation
(b) Work done by the system = Area of shaded portion on $P$-$V$ diagram
$= (300 - 100)10^{- 6} \times (100 - 200) \times 10^{3} = - 20\ J$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.