Which of the following relations is correct for the internal energy change $(\Delta U)$ in a process occurring at constant volume?

  • A
    $\Delta U = q_{(P)}$
  • B
    $\Delta U = q_{(P)} - q_{(V)}$
  • C
    $\Delta U = q_{(V)}$
  • D
    $\Delta U = q_{(V)} - q_{(P)}$

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