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In that equivalent circuit, the element representing mechanical power is

  • A.\( R_2(1 - s)/s \)
  • B.\( R_2/s \)
  • C.\( R_2 \) alone
  • D.\( R_2 s \)

Answer: A

Separating that term from the rotor resistance itself makes the power split explicit, and at small slip it is much the larger of the two. At unity slip it vanishes, which is why all the air gap power becomes heat at standstill.

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