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RC Circuits

RC Circuits
What is the angular difference between +j4 and –j4?

270°
90°
180°
30°

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RC Circuits
The complex number 6 + j6 is equivalent to

3645°
645°
8.4845°
8.4890°

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RC Circuits
A 2 k resistor is in series with a 0.015 F capacitor across a 15 kHz ac source. What is the magnitude of the total impedance and the phase angle?

73.4 and θ = –19.5°
707 and θ = –19.5°
2121 and θ = –19.5°
734 and θ = –38.9°

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RC Circuits
An ac circuit consists of a resistor and a capacitor. To increase the phase angle above 45°, the following condition must exist:

R > XC
R = XC
R < XC
R = 5XC

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RC Circuits
A 6 kHz sinusoidal voltage is applied to a series RC circuit. The frequency of the voltage across the resistor is

0 Hz
12 kHz
6 kHz
18 kHz

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RC Circuits
In a parallel RC circuit, there is 100 mA through the resistive branch and 100 mA through the capacitive branch. The total rms current is

200 mA
282 mA
100 mA
141 mA

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