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A $4$ – pole induction motor, supplied by a slightly unbalanced three-phase $50 Hz$ source, is rotating at $1400\:rpm$. The electrical frequency in $Hz$ of the induced negative sequence current in the rotor is

  1. $100$
  2. $98$
  3. $52$
  4. $48$
in Power Systems by (1.5k points)
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