Question

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

• A. $2000J$
• B. $400J$
• C. Zero
• D. $-2000J$

Answer 1

Answer: (B)

Net work done by the gas $=$ Area enclosed in $P-V$ curve, i.e., area of $\Delta ABC$
$=\frac{1}{2}\times 4\times 10^{-3}\times 2\times 10^5$
$=4\times 10^2=400J$