The P - V diagram of a system undergoing...

The `P - V` diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from `A rarr B rarr C` is `30 J` and `40 J` heat is given to the system. The change in internal energy between `A and C` is

`10j`

`70j`

`84j`

`134j`

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