* 66. (Ill) A 2.5-kll resistor in series with a 420-mH
Chapter 21, Problem 66(choose chapter or problem)
* 66. (Ill) A 2.5-kll resistor in series with a 420-mH inductor is driven by an ac power supply. At what frequency is the impedance double that of the impedance at 60 Hz?
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