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1. A 10 Ω resistor, a 90 mH coil, and a 0.015 μF capacitor are in series across an ac source. The impedance magnitude at 1,200 Hz below fr is ________.
(a) 1,616 Ω
(b) 161 Ω
(c) 3,387 Ω
(d) 1,771 Ω
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