Question

In the P-V diagram shown in figure, ABC is a semicircle. The work done in the process ABC is

• A. Zero
• B. $\frac{\pi }{2}$ atm L
• C. $-\frac{\pi }{2}$ atm L .
• D. 4 atm L .

Answer 1

The correct option is B $\frac{\pi }{2}$ atm L

$W_{AB}$ is negative (volume is decreasing) and $W_{BC}$ is positive (volume is increasing) and since, $|W_{BC}|>|W_{AB}|$
$\therefore$ Net work done is positive and area between semicircle which is equal to $\frac{\pi }{2}$ atm L .