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With the rotor turning at a slip \( s \) with respect to the forward field, its slip with respect to the backward field is

  • A.\( 1 - s \)
  • B.\( s - 2 \)
  • C.\( 2 - s \)
  • D.\( s \) itself

Answer: C

The backward field revolves the other way, so the relative speed is the sum rather than the difference, which gives a slip close to two in normal running. The backward torque is therefore small and the forward torque dominates.

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