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  4. The processes 3, 2 and 1 represent the respective isobaric, isothermal and adiabatic expansion of one mole of a gas initially at a pressure P from volume V to 2V . The work done is <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/8b49ef0e1065d42a8d15e1a93e15d0c7-.png />

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Q. The processes $ 3, 2 $ and $ 1 $ represent the respective isobaric, isothermal and adiabatic expansion of one mole of a gas initially at a pressure $ P $ from volume $ V $ to $ 2V $ . The work done is
image

J & K CETJ & K CET 2016Thermodynamics

Solution:

image
Work done = area under $P -V$ curve
As area under the $P -V$ curve is maximum for process $3$ and minimum for process $1$, so the work done is maximum in the process $3$ and minimum in the process $1$