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An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is __________

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An 8-pole, 3-phase, 50 Hz induction motor is operating at a speed of 720 rpm. The frequency of the rotor current of the motor in Hz is __________

(a) 2

(b) 4

(c) 3

(d) 1

I had been asked this question in exam.

My doubt stems from DC Motors in portion Characteristics of DC & AC Motors of Electric Drives

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