Question

A gas taken through the cycle $A\to B\to C\to A$, as shown, what is the net work done by the gas?

• A. $-2000\text{J}$
• B. $2000\text{J}$
• C. $1000\text{J}$
• D. $0\text{J}$

Answer 1

The correct option is C $1000\text{J}$

In cyclic processes,

$\text{Net work done}=\text{Area under the PV- graph =Area of}△ABC$

If the process is clockwise then work done would be positive otherwise negative. Here, the process is clockwise.

$W=\frac{1}{2}\times (7-2)\times {10}^{-3}\times (6-2)\times {10}^5=1000\text{J}$

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> Hence, $\left(C\right)$ is the correct answer.