A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________? August 11, 2021July 5, 2018 by admin A 3-phase 440 V, 50 Hz induction motor has 4% slip. The frequency of rotor e.m.f. will be____________? A. 200 Hz B. 50 HzC. 2 Hz D. 0.2 Hz