The $P-V$ diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from $A \to B \to C$ is $30J$ and $40J$ heat is given to the system. The change in internal energy between $A$ and $C$ is ....... $J$
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(a) Heat given $\Delta Q = 40 J$ and Work done $\Delta W = 30 J$
$⇒$ $\Delta U = \Delta Q - \Delta W = 40 -30 = 10 J.$
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