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When a system is taken from state A to s...

When a system is taken from state `A` to state `B` along path `ACB` as shown in figure below, `80 J` of heat flows into the system and the system does `30 J` of work.

When the system is returned from state `B` to `A` along the curve path, the work done on the system is `20 J`.
Does the system absorb or liberate heat and by how much ?

A

`- 70 J`, heat is liberated.

B

`-60 J`, heat is liberated

C

`+70 J`, heat is absorbed

D

`+60 J`, heat is absorbed.

Text Solution

Verified by Experts

The correct Answer is:
A
For `B` to `A`,
`Delta E= -50 J`
`w= +20 J`
`q= -50-20= -70`
heat is liberate.
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