Question

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

Hint:

Negative work means work done on the system.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Net work = area enclosed in PV diagram.
Step 2: Detailed Explanation:
\(W_{PQ} = 100 \times 10^3 \times (300 - 100) \times 10^{-6} = 20\ \mathrm{J}\)
\(W_{QR} = 0\)
\(W_{RS} = 200 \times 10^3 \times (100 - 300) \times 10^{-6} = -40\ \mathrm{J}\)
\(W_{SP} = 0\)
Net = \(20 - 40 = -20\ \mathrm{J}\)
Step 3: Final Answer:
Net work is -20 J.