Helium gas goes through a cycle \( \mathrm{ABCDA} \) (consisting of...

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