Discussion
An induction motor works by
Answer: D
Correct answer: inducing currents in its rotor from a rotating field
The three-phase stator winding produces a field rotating at synchronous speed. The rotor turns more slowly, so the field sweeps past it, induces currents in the shorted bars, and the interaction of those currents with the field produces torque. Everything follows from that: the rotor must lag the field, so slip can never be zero under load, and no electrical connection to the rotor is needed at all.
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