If $\Delta U$ and $\Delta W$ represent the increase in internal energy and work done by the system respectively in a thermodynamical process,which of the following is true?
- A$\Delta U = - \Delta W$ in an adiabatic process
- B$\Delta U = \Delta W$ in an isothermal process
- C$\Delta U = - \Delta W$ in an isothermal process
- D$\Delta U = \Delta W$ in an adiabatic process
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