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In a constant $V/f$ control of induction motor, the ratio $V/f$ is maintained constant from $0$ to base frequency, where $V$ is the voltage applied to the motor at fundamental frequency $f$. Which of the following statements relating to low frequency operation of the motor is $TRUE?$

  1. At low frequency, the stator flux increases from its rated value.
  2. At low frequency, the stator flux decreases from its rated value.
  3. At low frequency, the motor saturates.
  4. At low frequency, the stator flux remains unchanged at its rated value.
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