Question: A 3-phase induction motor runs at almost 140 rpm at no load and 50 rpm at full load when supplied with power from a 50 Hz, 3-phase supply. What is the corresponding speed of the rotor field with respect to the rotor?

Options

A : 20 revolution per minute

B : 80 revolution per minute

C : 90 revolution per minute

D : 70 revolution per minute

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