The net work done on the gas in the cycle ABCDA is
The net work done on the gas in the cycle ABCDA is
Zero
$276 \mathrm{R}$
$1076 \mathrm{R}$
$1904 \mathrm{R}$
Solution
$
\begin{aligned}
\text { Net work done in a cycle } & =W_{A B}+W_{B C}+W_{C B}+W_{B A} \\
& =400 R+2 \times 2.303 \times 500 R \ln 2-400 R-414 R \\
& =1000 R \times \ln 2-600 R \times \ln 2=400 R \times \ln 2=276 R
\end{aligned}
$