An ideal gas expands isothermally from a volume V1 to V2 and then compressed to original volume V1 adiabatically. Initial pressure is P1 and final pressure is P3. The total work done is W. Then -
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(3) From graph it is clear that P3 > P1.
Since area under adiabatic process (BCED) is greater than that of isothermal process (ABDE). Therefore net work done
⇒ W < 0