What is the theoretical efficiency of a heat engine?

  • A
    $\eta = 1 - \frac{T_2}{T_1}$
  • B
    $\eta = 1 + \frac{T_2}{T_1}$
  • C
    $\eta = \frac{T_2}{T_1} - 1$
  • D
    $\eta = \frac{T_1}{T_2}$

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