The net work done through a series of changes reported in figure for an ideal gas is

Options

A. `-6 xx 10^(5)J`
B. `-7 xx 10^(5)J`
C. `-12 xx 10^(5)J`
D. `+12 xx 10^(5)J`

Explanation

Net wrok done = Area convered by `PV` curve
= Area of `DeltaABE +` Area of square `BCEF +` Area of `DeltaCDF`
` = -[(1)/(2) (3xx10^(+5) - 1xx10^(5))xx2]`
`+3 xx 10^(5) xx 2 +(1)/(2) [(1xx10^(5) - 3xx10^(5)) xx1]`
`=- [2 xx 10^(5) +6 xx 10^(5) - 1xx 10^(5)]`
`=- 7 xx 10^(5)J`