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A $10-\text { pole, } 50 \mathrm{~Hz}, 240 \mathrm{~V},$ single phase induction motor runs at $540 ~\mathrm{RPM}$ while driving rated load. The frequency of induced rotor currents due to backward field is 

  1. $100 \mathrm{~Hz}$ 
  2. $95 \mathrm{~Hz}$ 
  3. $10 \mathrm{~Hz}$
  4. $5 \mathrm{~Hz}$ 

     

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