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Which one of the following options is correct regarding the typical double-squirrel-cage structure used in induction motors?

  1. At starting, a larger portion of the rotor current flows in the outer cage
  2. At starting, a larger portion of the rotor current flows in the inner cage
  3. At rated speed, most of the rotor current flows in the outer cage
  4. The purpose of the double-squirrel-cage structure is to lower the effective rotor resistance at starting

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