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When a system is taken from state f alon...

When a system is taken from state f along path `iaf, Q = 50 J` and `W = 20 J`. Along path `ibf, Q = 35 J`. If `W = -13 J` for the curved return path `f I, Q` for this path is

A

33 J

B

23 J

C

`-7` J

D

`-43 J`

Text Solution

Verified by Experts

The correct Answer is:
D
Process iaf: `DeltaQ=DeltaU+DeltaW`
`DeltaU=U_f-U_i=DeltaQ-DeltaW=50-20=30J`
Process fi: `DeltaQ=DeltaU+DeltaW=U_i-U_f+DeltaW`
`=-30-13=-43J`
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