Q.

The net work done in a thermodynamic cycle that expands isobarically at pressure of two atmospheres (2x105 Pa)  followed by isothermal expansion to a pressure of 1atmosphere and volume 2litres, isobaric compression to 1 litre and isothermal compression to the original state, is

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a

Data insufficient

b

70 J

c

140 J

d

30 J

answer is B.

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The net work done in a thermodynamic cycle that expands isobarically at pressure of two atmospheres (2x105 Pa)  followed by isothermal expansion to a pressure of 1atmosphere and volume 2litres, isobaric compression to 1 litre and isothermal compression to the original state, is