A 2 kΩ resistor is in series with a 0.015 µF capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?
A. 73.4 Ω and θ = -19.5°
B. 707 Ω and θ = -19.5°
C. 2121 Ω and θ = -19.5°
D. 734 Ω and θ = -38.9°
Answer: Option C
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Related Questions on RC Circuits
When the frequency of the source voltage decreases, the impedance of a parallel RC circuit
A. Increases
B. Decreases
C. Does not change
D. Decreases to zero
Xc = 1/2πfC = 707 Ω
|z| = sqrt(R^2 + Xc^2) = 2121 Ω
Phase angle = arctangent(Xc/R) = 19.5°