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
Answer: Option A
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fr = 1/2*pi*sqrt of LC.
fr = 4331.648.
f = fr-1200Hz=3131.64.
Z = sqrt of(R^2+(XL-XC)^2).
Z = 1617 ohm.