Helium gas goes through a cycle \( A B C D A \) (consisting of two ...

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Helium gas goes through a cycle \( A B C D A \) (consisting of two isochoric and isobaric lines) as shown in figure. Efficiency of
\( \mathrm{P} \) this cycle is nearly
(Assume the gas to be close to ideal gas) [AIEEE 2012]
W
(a) \( 15.4 \% \)
(b) \( 9.1 \% \)
(c) \( 10.5 \% \)
(d) \( 12.5 \% \)
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