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An ideal gas expands isothermally from volume $V_1$ to volume $V_2$. It is then compressed to the original volume $V_1$ adiabatically. If $p_1, p_2$ and $W$ represent the initial pressure, final pressure and the net work done by the gas respectively during the entire process, then
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The correct answer is:
$p_2>p_1, W < 0$
From graph it is clear that, $p_2>p_1$.
Since, area under adiabatic process (BCED) is greater than that of isothermal process ( $A B D E)$. Therefore, net work done
$\because \quad W_A>W_1$
$\Rightarrow \quad W < 0$
Hence option (d) is correct.
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