Textbook Question
What is the reactance of a 3.00-H inductor at a frequency of 80.0 Hz?
595
views
31. Alternating Current
Inductors in AC Circuits
Back31. Alternating Current
Inductors in AC Circuits
- Multiple Choice
Will a frequency f = 60 Hz or ω = 75 s−1 produce a larger max current in an inductor connected to an AC source?
538views4rank - Multiple ChoiceA certain laptop charger says that the provided to the laptop is 12 V. You know this charger is plugged into an outlet for which is 120 V, such that there must be a transformer inside the laptop charger. If the number of windings of wire on the laptop side of the transformer is 60, how many windings of wire must be on the outlet side of the transformer?588views
- Multiple ChoiceThe peak current to and from an inductor is when the emf source has a peak voltage and frequency . What is the peak current to and from the inductor if the frequency and peak voltage are doubled to and . respectively?961views1comments
- Multiple ChoiceAn AC circuit consists of an inductor and an emf source with frequency . If the source is turned on at , and the first time the voltage across the inductor reaches a maximum value is at , when is the first time the current in the inductor is at a maximum?598views
- Multiple ChoiceThe peak current to and from an inductor is i when the emf source has a peak voltage V and frequency f. What is the peak current to and from the inductor if the frequency and peak voltage are doubled to 2f and 2V, respectively?669views
- Textbook Question
What is the inductance of an inductor whose reactance is 120 Ω at 80.0 Hz?
929views - Textbook Question
An inductor is connected to a 15 kHz oscillator. The peak current is 65 mA when the rms voltage is 6.0 V. What is the value of the inductance L?
62views - Textbook Question
The peak current through an inductor is 10 mA. What is the peak current if the emf peak voltage is doubled (at the original frequency)?
381views - Textbook Question
FIGURE EX32.24 shows voltage and current graphs for an inductor. What is the emf frequency f?
45views - Textbook Question
FIGURE EX32.24 shows voltage and current graphs for an inductor. What is the value of the inductance L?
19views - Textbook Question
In some experiments, very tiny distances or spaces ( ≈ nm ) can be measured by using capacitance. Consider forming an LC circuit using a parallel-plate capacitor with plate area A, and a known inductance L. If charge is found to oscillate in this circuit at frequency f = ω/2π when the capacitor plates are separated by distance x, show that x = 4π² Aε₀f²L.
267views - Textbook Question
In some experiments, very tiny distances or spaces ( ≈ nm ) can be measured by using capacitance. Consider forming an LC circuit using a parallel-plate capacitor with plate area A, and a known inductance L. When the plate separation is changed by ∆x, the circuit’s oscillation frequency will change by ∆f. Show that ∆x/x ≈ 2(∆f/f).
322views - Textbook Question
In some experiments, very tiny distances or spaces ( ≈ nm ) can be measured by using capacitance. Consider forming an LC circuit using a parallel-plate capacitor with plate area A, and a known inductance L. If f is on the order of 1 MHz and can be measured to a precision of ∆f = 1 Hz, with what percent accuracy can x be determined? Assume fringing effects at the capacitor’s edges can be neglected.
229views - Textbook Question
(II) A 75-W incandescent lightbulb is designed to operate with an applied ac voltage of 120 V rms. The bulb is placed in series with an inductor L, and this series combination is then connected to a 60.0-Hz 240-V rms voltage source. For the bulb to operate properly, determine the required value for L. Assume the bulb has resistance R and negligible inductance.
454views