Question 1

An ac circuit is shown in the figure.The rms current in the circuit is 1.3 A.What is the peak magnetic energy in the inductance?

Accepted Answer

A) 0.32 J 
B) 0.16 J 
C) 0.48 J 
D) 0.64 J 
E) 0.80 J 
A) 0.32 J 
B) 0.16 J 
C) 0.48 J 
D) 0.64 J 
E) 0.80 J A

Question 2

An ac series circuit consists of a voltage source,an 880-Ω resistor,and an inductance L.(There is no capacitance in the circuit.)The current amplitude is 0.60 A,and the phase angle between the source voltage and the current has a magnitude of 41°.
(a)Does the source voltage lag or lead the current?
(b)What is the voltage amplitude of the source?

Accepted Answer

(a)The source voltage leads the current.
(b)700 volts

Question 3

The 60-Hz ac source of the series circuit shown in the figure has a voltage amplitude of
120 V.The capacitive reactance is 790 Ω,the inductive reactance is 270 Ω,and the resistance is 500Ω.   (a)What is the capacitance of the capacitor?
(b)What is the inductance of the inductor?

Accepted Answer

(a)3.4 µF (b)720 mH

Question 4

A series LRC circuit has a sinusoidal voltage supplied to it at   with a peak voltage of   a   resistance,a   capacitor,and a   inductance.What is the peak current for this circuit?

Accepted Answer

A) 3.5 μA 
B) 2.3 μA 
C) 4.2 μA 
D) 6.6 μA 
A) 3.5 μA 
B) 2.3 μA 
C) 4.2 μA 
D) 6.6 μA

Question 5

The inductor in a radio receiver carries a current of amplitude 200 mA when a voltage of amplitude 2.40 V is across it at a frequency of 1400 kHz.What is the value of the inductance?

Accepted Answer

A) 1.43 µH 
B) 1.36 µH 
C) 9.20 µH 
D) 4.42 µH 
E) 1.97 µH 
A) 1.43 µH 
B) 1.36 µH 
C) 9.20 µH 
D) 4.42 µH 
E) 1.97 µH

Question 6

A series LRC ac circuit has a peak voltage of   and a peak current of   If the current lags the voltage by   what is the average power of the circuit?

Accepted Answer

A) 91 W 
B) 182 W 
C) 78 W 
D) 156 W 
A) 91 W 
B) 182 W 
C) 78 W 
D) 156 W

Question 7

A 25.0-mH inductor,a 2.00-μF capacitor,and a certain resistor are connected in series across an ac voltage source at 1000 Hz.If the impedance of this circuit is 200 Ω,what is the resistance of the resistor?

Accepted Answer

A) 100 Ω 
B) 184 Ω 
C) 200 Ω 
D) 552 Ω 
E) 579 Ω 
A) 100 Ω 
B) 184 Ω 
C) 200 Ω 
D) 552 Ω 
E) 579 Ω

Question 8

A series ac circuit consists of an inductor having a reactance of 80 Ω and an inductance of 190 mH,a 40-Ω resistor,a capacitor whose reactance is 100 Ω,and an ac source.The rms current in the circuit is measured to be 2.2 A.What is the rms voltage of the source?

Accepted Answer

A) 98 V 
B) 96 V 
C) 93 V 
D) 91 V 
E) 88 V 
A) 98 V 
B) 96 V 
C) 93 V 
D) 91 V 
E) 88 V

Question 9

An LRC ac series circuit has R = 15 Ω,L = 25 mH,and C = 30 μF.The circuit is connected to a 120-V (rms)ac source with frequency 200 Hz.
(a)What is the average power dissipated by the circuit?
(b)What is the power factor for the circuit?

Accepted Answer

The answer of An LRC ac series circuit has R...

Question 10

A 120-V rms voltage at 60.0 Hz is applied across an inductor,a capacitor,and a resistor in series.If the peak current in this circuit is 0.8484 A,what is the impedance of this circuit?

Accepted Answer

A) 200 Ω 
B) 141 Ω 
C) 20.4 Ω 
D) 120 Ω 
E) 100 Ω 
A) 200 Ω 
B) 141 Ω 
C) 20.4 Ω 
D) 120 Ω 
E) 100 Ω

Question 11

An LRC series circuit consists of an 85.0-Ω resistor,a 14.0-μF capacitor,a 1.50-mH inductor,and a variable frequency ac source of voltage amplitude 13.25 V.At what angular frequency will the inductive reactance be 4.00 times as large as the capacitive reactance?

Accepted Answer

A) 1.38 × 104 rad/s 
B) 6.90 × 103 rad/s 
C) 3.45 × 104 rad/s 
D) 2.20 × 104 rad/s 
E) 1.10 × 104 rad/s 
A) 1.38 × 104 rad/s 
B) 6.90 × 103 rad/s 
C) 3.45 × 104 rad/s 
D) 2.20 × 104 rad/s 
E) 1.10 × 104 rad/s

Question 12

If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA,the frequency is closest to

Accepted Answer

A) 32.6 MHz. 
B) 5.20 MHz. 
C) 32.6 kHz. 
D) 5.20 kHz. 
E) 32.6 Hz. 
A) 32.6 MHz. 
B) 5.20 MHz. 
C) 32.6 kHz. 
D) 5.20 kHz. 
E) 32.6 Hz.

Question 13

An ac source of period T and maximum voltage V is connected to a single unknown ideal element that is either a resistor,and inductor,or a capacitor.At time t = 0 the voltage is zero.At time t = T/4 the current in the unknown element is equal to zero,and at time t = T/2 the current is I = -Imax,where Imax is the current amplitude.What is the unknown element?

Accepted Answer

A) a resistor 
B) an inductor 
C) a capacitor 
D) an inductor or a capacitor 
A) a resistor 
B) an inductor 
C) a capacitor 
D) an inductor or a capacitor

Question 14

A series LRC circuit consists of a 100-Ω resistor,a 0.100-μF capacitor and a 2.00-mH inductor connected across a 120-V rms ac voltage source operating at   .At what frequency will this circuit be in resonance?

Accepted Answer

A) 70.7 kHz 
B) 17.9 kHz 
C) 22.5 kHz 
D) 35.3 kHz 
E) 11.3 kHz 
A) 70.7 kHz 
B) 17.9 kHz 
C) 22.5 kHz 
D) 35.3 kHz 
E) 11.3 kHz

Question 15

An LRC ac circuit has a reactance (due to its capacitance)of 17 kΩ,a reactance (due to its inductance)of 9.0 kΩ,and a resistance of 28 kΩ.What is the power factor of the circuit?

Accepted Answer

A) 0.96 
B) 0.28 
C) 1.04 
D) 0.48 
A) 0.96 
B) 0.28 
C) 1.04 
D) 0.48

Question 16

An ac source having a maximum voltage output of 30 V is connected in series with a 50-Ω resistor,a 0.60-H inductor,and a 20-µF capacitor.What is the maximum charge on the capacitor when the frequency of the source is adjusted so that the circuit is in resonance?

Accepted Answer

A) 1.0 mC 
B) 0.00 mC 
C) 2.1 mC 
D) 4.2 mC 
E) 8.4 mC 
A) 1.0 mC 
B) 0.00 mC 
C) 2.1 mC 
D) 4.2 mC 
E) 8.4 mC

Question 17

A series circuit has a resistance of 4.0 Ω,a reactance (due to the capacitance)of 21.0 Ω,and a reactance (due to the inductance)of 17.0 Ω.Find the impedance of the circuit.

Accepted Answer

A) 5.7 Ω 
B) 27 Ω 
C) 8.0 Ω 
D) 42 Ω 
A) 5.7 Ω 
B) 27 Ω 
C) 8.0 Ω 
D) 42 Ω

Question 18

A series LRC ac circuit has a resistance of 4.0 kΩ,a capacitance of 33.0 μF,and an inductance of 23.0 H.If the frequency of the alternating current is 2.0/π kHz,what is the phase angle between the voltage and the current?

Accepted Answer

A) 1.5 rad 
B) -1.6 rad 
C) 23 rad 
D) 3.1 rad 
A) 1.5 rad 
B) -1.6 rad 
C) 23 rad 
D) 3.1 rad

Question 19

An ac circuit is shown in the figure.The rms current in the circuit is measured to be 1.8 A.What is the capacitance of the capacitor?

Accepted Answer

A) 23 μF 
B) 24 μF 
C) 21 μF 
D) 19 μF 
E) 18 μF 
A) 23 μF 
B) 24 μF 
C) 21 μF 
D) 19 μF 
E) 18 μF

Question 20

A series LRC circuit consists of a 5.00-pF capacitor,a 7.25-mH inductor,a 75.0-Ω resistor,and a 50.0-V ac power source of variable frequency.At what frequency will the impedance of this circuit be equal to 75.0 Ω?

Accepted Answer

The answer of A series LRC circuit consists of a...

Exam 32: Ac Circuits

An ac circuit is shown in the figure.The rms current in the circuit is 1.3 A.What is the peak magnetic energy in the inductance?

The 60-Hz ac source of the series circuit shown in the figure has a voltage amplitude of 120 V.The capacitive reactance is 790 Ω,the inductive reactance is 270 Ω,and the resistance is 500Ω. (a)What is the capacitance of the capacitor? (b)What is the inductance of the inductor?

A series LRC circuit has a sinusoidal voltage supplied to it at with a peak voltage of a resistance,a capacitor,and a inductance.What is the peak current for this circuit?

The inductor in a radio receiver carries a current of amplitude 200 mA when a voltage of amplitude 2.40 V is across it at a frequency of 1400 kHz.What is the value of the inductance?

A series LRC ac circuit has a peak voltage of and a peak current of If the current lags the voltage by what is the average power of the circuit?

A 25.0-mH inductor,a 2.00-μF capacitor,and a certain resistor are connected in series across an ac voltage source at 1000 Hz.If the impedance of this circuit is 200 Ω,what is the resistance of the resistor?

A series ac circuit consists of an inductor having a reactance of 80 Ω and an inductance of 190 mH,a 40-Ω resistor,a capacitor whose reactance is 100 Ω,and an ac source.The rms current in the circuit is measured to be 2.2 A.What is the rms voltage of the source?

An LRC ac series circuit has R = 15 Ω,L = 25 mH,and C = 30 μF.The circuit is connected to a 120-V (rms)ac source with frequency 200 Hz. (a)What is the average power dissipated by the circuit? (b)What is the power factor for the circuit?

A 120-V rms voltage at 60.0 Hz is applied across an inductor,a capacitor,and a resistor in series.If the peak current in this circuit is 0.8484 A,what is the impedance of this circuit?

An LRC series circuit consists of an 85.0-Ω resistor,a 14.0-μF capacitor,a 1.50-mH inductor,and a variable frequency ac source of voltage amplitude 13.25 V.At what angular frequency will the inductive reactance be 4.00 times as large as the capacitive reactance?

If the voltage amplitude across an 8.50-nF capacitor is equal to 12.0 V when the current amplitude through it is 3.33 mA,the frequency is closest to

A series LRC circuit consists of a 100-Ω resistor,a 0.100-μF capacitor and a 2.00-mH inductor connected across a 120-V rms ac voltage source operating at .At what frequency will this circuit be in resonance?

An LRC ac circuit has a reactance (due to its capacitance)of 17 kΩ,a reactance (due to its inductance)of 9.0 kΩ,and a resistance of 28 kΩ.What is the power factor of the circuit?

An ac source having a maximum voltage output of 30 V is connected in series with a 50-Ω resistor,a 0.60-H inductor,and a 20-µF capacitor.What is the maximum charge on the capacitor when the frequency of the source is adjusted so that the circuit is in resonance?

A series circuit has a resistance of 4.0 Ω,a reactance (due to the capacitance)of 21.0 Ω,and a reactance (due to the inductance)of 17.0 Ω.Find the impedance of the circuit.

A series LRC ac circuit has a resistance of 4.0 kΩ,a capacitance of 33.0 μF,and an inductance of 23.0 H.If the frequency of the alternating current is 2.0/π kHz,what is the phase angle between the voltage and the current?

An ac circuit is shown in the figure.The rms current in the circuit is measured to be 1.8 A.What is the capacitance of the capacitor?

A series LRC circuit consists of a 5.00-pF capacitor,a 7.25-mH inductor,a 75.0-Ω resistor,and a 50.0-V ac power source of variable frequency.At what frequency will the impedance of this circuit be equal to 75.0 Ω?

Concepts of Motion

Kinematics in One Dimension

Vectors and Coordinate Systems

Kinematics in Two Dimensions

Force and Motion

Dynamics I: Motion Along a Line

Newtons Third Law

Dynamics II: Motion in a Plane

Work and Kinetic Energy

Interactions and Potential Energy

Impulse and Momentum

Rotation of a Rigid Body

Newtons Theory of Gravity

Fluids and Elasticity

Oscillations

Traveling Waves

Superposition

A Macroscopic Description of Matter

Work, heat, and the First Law of Thermodynamics

The Micromacro Connection

Heat Engines and Refrigerators

Electric Charges and Forces

The Electric Field

Gausss Law

The Electric Potential

Potential and Field

Current and Resistance

Fundamentals of Circuits

The Magnetic Field

Electromagnetic Induction

Electromagnetic Fields and Waves

Wave Optics

Ray Optics

Optical Instruments

Relativity

The Foundations of Modern Physics

Quantization

Wave Functions and Uncertainty

One-Dimensional Quantum Mechanics

Atomic Physics

Nuclear Physics

Filters