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?
A. 636 Ω
B. 3,769 Ω
C. 433 Ω
D. 4,337 Ω
Answer: Option D
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XL=2*pi*f*L
Xc=1/(2*pi*f*C)
Z=sqrt[R^2+(XL-Xc)^2]