A three-phase 6 pole, induction motor is rotating with 3% slip. Supply frequency is 50 Hz. Calculate

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Question:

A three-phase 6 pole, induction motor is rotating with 3% slip. Supply frequency is 50 Hz. Calculate the synchronous speed (Ns) and the frequency of rotor current (fr) in Hz.
a) Ns = 1500 rpm & fr = 50 Hz
b) Ns = 1500 rpm & fr = 3.0 Hz
c) Ns = 1000 rpm & fr = 50 Hz
d) Ns = 1000 rpm & fr = 1.5 Hz