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The \( P-V \) diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the
\( \mathrm{P} \) system in going from \( A \rightarrow B \rightarrow C \) is \( 30 J \) and \( 40 J \) heat is given to the system. The change in internal energy between
W \( A \) and \( C \) is
(a) \( 10 \mathrm{~J} \)
(b) \( 70 \mathrm{~J} \)
(c) \( 84 \mathrm{~J} \)
(d) \( 134 \mathrm{~J} \)
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