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A thermodynamic process is shown in the ...

A thermodynamic process is shown in the following figure. The process and volumes corresponding to some points in the figure are:
`P_(A) =3 xx 10^(4)Pa`,
`V_(A) =2 xx 10^(-3) m^(-3)`,
`P_(B) = 8 xx 10^(4) Pa, V_(D) = 5 xx 10^(-3) m^(3)`
In process `AB, 600J` of heat is added to the system and in the process `BC, 200J` of heat is added to the system. the change in internla energy of the system in the process `AC` would be

A

`560 J`

B

`800 J`

C

`600 J`

D

`640 J`

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