The $P-V$ diagram of a system undergoing thermodynamic transformation is shown in figure. The work done on the system in going from $A → B → C$ is $50 J$ and $ 20\, cal$ heat is given to the system. The change in internal energy between $A$ and $C$ is ...... $J$
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(d) Heat given $\Delta Q = 20\,cal = 20 \times 4.2\, = 84\,J$.
Work done $\Delta W = -50 J$ [As process is anticlockwise]
By first law of thermodynamics
==> $\Delta U = \Delta Q - \Delta W = 84 - ( - \,50)\, = 134J$
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