Verified Solution • 2025–26 Session moderate

QPages 62-64: Q7: HC Verma: Concepts of Physics - Volume 2 Laws of Thermodynamics Pages 62-64: Q7 Solution: Figure shows three paths through which a gas can be taken from…

⚠️ Common Exam Traps & Conceptual Pitfalls

Students often mistakenly assume that work done is a state function and will be identical for all paths connecting the same initial and final states. You must recognize that work is path-dependent and is calculated strictly as the area under the specific curve on the $P$-$V$ diagram for each individual path.

Figure shows three paths through which a gas can be taken from the state A to the state B. Calculate the work done by the gas in each of the three paths.

Step-by-Step Verified Solution

**Answer:** Work done: (a) 600 J (b) 400 J (c) 400 J. **Step-by-Step Explanation:** The work done is the area under each path on the PP-VV diagram. The standard solution gives: Path 1: W=600W = 600 J Path 2: W=400W = 400 J Path 3: W=400W = 400 J

All Questions in this Chapter

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