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When a system is taken from state i to state f along the path iaf, it is found that `Q=50 cal and W=20 cal`. Along the path ibf `Q=36cal`. W along the path ibf is

A

6 cal

B

16 cal

C

66 cal

D

14 cal

Text Solution

Verified by Experts

The correct Answer is:
A
From the first law of themodynamics, we have
`Q=triangleU+W`
For path iaf,
`50 =triangleU+20" ":. triangleU=U_(f)-U_(i)=30` cal
For path ibf,
`Q=triangleU+W" " implies W=Q-triangleU=36-30=6` cal.
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