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A resistor of 3 kΩ, a 0.05 µF capacitor, and a 120 mH coil are in series across a 5 kHz, 20 V ac source. What is the impedance, expressed in polar form?

636 Ω
3,769 Ω
433 Ω
4,337 Ω

Correct Answer: 4,337 Ω

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