The field coils used in an ac motor are designed to have a resistance of 0.45

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The field coils used in an ac motor are designed to have a resistance of 0.45 Ω and an impedance of 35.0 Ω. What inductance is required if the frequency of the ac source is 

(a) 60.0 Hz? 

(b) 0.20 kHz?

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