Question 1

A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer. If the total rms current drawn is 16.7 A, then calculate the power rating of the heater.

Accepted Answer

A)  2000 W 
B)  800 W 
C)  3200 W 
D)  1200 W 
E)  2800 W 
A)  2000 W 
B)  800 W 
C)  3200 W 
D)  1200 W 
E)  2800 W

Question 2

Use the following figure to answer the next problem:  
-The diagram that correctly represents the phase relationship between the current through the resistor and the voltage across the inductor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 3

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10  $\Omega$  is driven by a generator with a maximum EMF of 100 V and a variable frequency. The resonant frequency f0 of this circuit is

Accepted Answer

A)  22.5 Hz 
B)  45.0 Hz 
C)  90.0 Hz 
D)  180 Hz 
E)  360 Hz 
A)  22.5 Hz 
B)  45.0 Hz 
C)  90.0 Hz 
D)  180 Hz 
E)  360 Hz

Question 4

Use the following figure for the next three problems.   An AC power supply, V = 20 V sin  $ \omega $t where  $ \omega $ = 200 rad/s is connect to an inductor L = 180 mH and a capacitor C = 25 $\mu$F. XL = 36 ohms, XC = 200 ohms, Z = 43.9 ohms
-What is the peak current flow out of the AC power supply?

Accepted Answer

A)  85 mA 
B)  0.56 A 
C)  0.46 A 
D)  0.10 A 
E)  None of these is correct. 
A)  85 mA 
B)  0.56 A 
C)  0.46 A 
D)  0.10 A 
E)  None of these is correct.

Question 5

You connect a 100-$\Omega$ resistor, a 800-mH inductor, and a 10.0-$\mu$F capacitor in series across a 60.0-Hz, 120-V (peak) source. The approximate resonant frequency of your circuit is

Accepted Answer

A)  354 Hz 
B)  60 Hz 
C)  56 Hz 
D)  37 Hz 
E)  None of these is correct. 
A)  354 Hz 
B)  60 Hz 
C)  56 Hz 
D)  37 Hz 
E)  None of these is correct.

Question 6

You connect a 250-$\Omega$ resistor, a 1.20-mH inductor, and a 1.80-F$\mu$F capacitor in series across a 60.0-Hz, 120-V (peak) source. The resonant frequency of your circuit is approximately

Accepted Answer

A)  56.9 Hz 
B)  80.5 kHz 
C)  3.42 kHz 
D)  37.8 kHz 
E)  165 Hz 
A)  56.9 Hz 
B)  80.5 kHz 
C)  3.42 kHz 
D)  37.8 kHz 
E)  165 Hz

Question 7

An inductor with inductance L = 10 mH is connected to a power supply which provides a current I = 5 mA sin  $ \omega $t. The maximum back EMF is

Accepted Answer

A)  5 mV 
B)  10 mV 
C)  25 $\mu$V 
D)  50 $\mu$V 
E)  0 V 
A)  5 mV 
B)  10 mV 
C)  25 $\mu$V 
D)  50 $\mu$V 
E)  0 V

Question 8

You connect a 50.0-$\Omega$ resistor, a 2.40-mH inductor, and a 5.60-pF capacitor in series across a 60.0-Hz, 120-V (peak) source. The Q factor for this circuit is approximately

Accepted Answer

A)  181 
B)  103 
C)  54.6 
D)  414 
E)  34.5 
A)  181 
B)  103 
C)  54.6 
D)  414 
E)  34.5

Question 9

You have a 30-µH inductor and want to form a 1.0-MHz parallel, resonant circuit. You need a capacitor of

Accepted Answer

A)  approximately 0.84 nF. 
B)  approximately 1.2 nF. 
C)  approximately 2.1 µF. 
D)  approximately 33 µF. 
E)  None of these is correct. 
A)  approximately 0.84 nF. 
B)  approximately 1.2 nF. 
C)  approximately 2.1 µF. 
D)  approximately 33 µF. 
E)  None of these is correct.

Question 10

Use the following figure for the next three problems.  
-The figure shows the voltage and current for a(n)

Accepted Answer

A)  inductor. 
B)  capacitor. 
C)  resistor. 
D)  inductor and capacitor. 
E)  inductor and resistor. 
A)  inductor. 
B)  capacitor. 
C)  resistor. 
D)  inductor and capacitor. 
E)  inductor and resistor.

Question 11

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10  $\Omega$  is driven by a generator with a maximum EMF of 100 V and a variable frequency. The maximum current Im at resonance is

Accepted Answer

A)  3.21 A 
B)  5.32 A 
C)  7.64 A 
D)  9.55 A 
E)  10.0 A 
A)  3.21 A 
B)  5.32 A 
C)  7.64 A 
D)  9.55 A 
E)  10.0 A

Question 12

An inductor is placed across an AC generator that has a maximum EMF of 170 V. For a frequency of 3000 Hz, the rms current through the inductor is 5.0 A. Find the value of the inductor.

Accepted Answer

A)  8.0 * 10-3 H 
B)  9.2 * 10-4 H 
C)  1.8*10-3 H 
D)  1.3 * 10-3 H 
E)  5.6 * 10-3 H 
A)  8.0 * 10-3 H 
B)  9.2 * 10-4 H 
C)  1.8*10-3 H 
D)  1.3 * 10-3 H 
E)  5.6 * 10-3 H

Question 13

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are Vrms = 12 V, L = 5.0 mH, C = 4.0 $\mu$F, and R = 10$\Omega$. Under steady-state conditions, the rms current in the circuit will be

Accepted Answer

A)  0.513 A 
B)  0.725 A 
C)  0.919 A 
D)  1.23 A 
E)  1.56 A 
A)  0.513 A 
B)  0.725 A 
C)  0.919 A 
D)  1.23 A 
E)  1.56 A

Question 14

At what frequency is the reactance of a 2-mH inductor equal to the reactance of a
100-pF capacitor?

Accepted Answer

A)  2.2* 106 Hz 
B)  1.3 *1011 Hz 
C)  3.6 *105 Hz 
D)  600 Hz 
E)  none of the above 
A)  2.2* 106 Hz 
B)  1.3 *1011 Hz 
C)  3.6 *105 Hz 
D)  600 Hz 
E)  none of the above

Question 15

Use the following figure for the next three problems.   The battery has a voltage V = 6 V, the inductance of the inductor L = 12 mH and the capacitance of the capacitor C = 8 $\mu$F. Assume that the inductor and the wires have zero resistance.
-The switch S was at position a for a long time when it is switched to b. What is the charge on the capacitor at t = 0 s?

Accepted Answer

A)  0.75 $\mu$C 
B)  1.33 $\mu$C 
C)  48 $\mu$C 
D)  72$\mu$C 
E)  zero 
A)  0.75 $\mu$C 
B)  1.33 $\mu$C 
C)  48 $\mu$C 
D)  72$\mu$C 
E)  zero

Question 16

A 10-mH inductor has an internal resistance of 10 $\Omega$. The impedance of this inductor for a frequency of 60 Hz is approximately

Accepted Answer

A)  3.77 $\Omega$ 
B)  10 $\Omega$ 
C)  13.8 $\Omega$ 
D)  10.6 $\Omega$ 
E)  none of these is correct 
A)  3.77 $\Omega$ 
B)  10 $\Omega$ 
C)  13.8 $\Omega$ 
D)  10.6 $\Omega$ 
E)  none of these is correct

Question 17

As the frequency in this simple AC circuit increases, the rms current through the resistor

Accepted Answer

A)  increases. 
B)  does not change. 
C)  may increase or decrease depending on the magnitude of the original frequency. 
D)  may increase or decrease depending on the magnitude of the resistance. 
E)  decreases. 
A)  increases. 
B)  does not change. 
C)  may increase or decrease depending on the magnitude of the original frequency. 
D)  may increase or decrease depending on the magnitude of the resistance. 
E)  decreases.

Question 18

What is the resistance of a regular 75-W light bulb connected to a 120-V AC outlet?

Accepted Answer

A)  190 $\Omega$ 
B)  1.6 $\Omega$ 
C)  0.62 $\Omega$ 
D)  5.2 *10-3 $\Omega$ 
E)  270 $\Omega$ 
A)  190 $\Omega$ 
B)  1.6 $\Omega$ 
C)  0.62 $\Omega$ 
D)  5.2 *10-3 $\Omega$ 
E)  270 $\Omega$

Question 19

A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor. The maximum current in this circuit after a long time has passed will be

Accepted Answer

A)  0 
B)  8.83 A 
C)  15.4 A 
D)  21.2 A 
E)  some value that cannot be determined from the given information. 
A)  0 
B)  8.83 A 
C)  15.4 A 
D)  21.2 A 
E)  some value that cannot be determined from the given information.

Question 20

When you close the switch S in the figure, the potential between A and B drops to zero. The current in the top loop does not immediately drop to zero because

Accepted Answer

A)  the top loop has less resistance than the bottom loop. 
B)  an EMF is generated in the inductor L. 
C)  an EMF is generated in the resistor R. 
D)  the current depends only on the resistance in the circuit. 
E)  Kirchhoff's junction rule states that the current into a junction must equal the current out of the junction. 
A)  the top loop has less resistance than the bottom loop. 
B)  an EMF is generated in the inductor L. 
C)  an EMF is generated in the resistor R. 
D)  the current depends only on the resistance in the circuit. 
E)  Kirchhoff's junction rule states that the current into a junction must equal the current out of the junction.

A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer. If the total rms current drawn is 16.7 A, then calculate the power rating of the heater.

Use the following figure to answer the next problem: -The diagram that correctly represents the phase relationship between the current through the resistor and the voltage across the inductor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 $\Omega$ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The resonant frequency f₀ of this circuit is

You connect a 100- $\Omega$ resistor, a 800-mH inductor, and a 10.0- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The approximate resonant frequency of your circuit is

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80-F $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The resonant frequency of your circuit is approximately

An inductor with inductance L = 10 mH is connected to a power supply which provides a current I = 5 mA sin $\omega$ t. The maximum back EMF is

You connect a 50.0- $\Omega$ resistor, a 2.40-mH inductor, and a 5.60-pF capacitor in series across a 60.0-Hz, 120-V (peak) source. The Q factor for this circuit is approximately

You have a 30-µH inductor and want to form a 1.0-MHz parallel, resonant circuit. You need a capacitor of

Use the following figure for the next three problems. -The figure shows the voltage and current for a(n)

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 $\Omega$ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The maximum current I_m at resonance is

An inductor is placed across an AC generator that has a maximum EMF of 170 V. For a frequency of 3000 Hz, the rms current through the inductor is 5.0 A. Find the value of the inductor.

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are V_rms = 12 V, L = 5.0 mH, C = 4.0 $\mu$ F, and R = 10 $\Omega$ . Under steady-state conditions, the rms current in the circuit will be

At what frequency is the reactance of a 2-mH inductor equal to the reactance of a 100-pF capacitor?

A 10-mH inductor has an internal resistance of 10 $\Omega$ . The impedance of this inductor for a frequency of 60 Hz is approximately

As the frequency in this simple AC circuit increases, the rms current through the resistor

What is the resistance of a regular 75-W light bulb connected to a 120-V AC outlet?

A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor. The maximum current in this circuit after a long time has passed will be

When you close the switch S in the figure, the potential between A and B drops to zero. The current in the top loop does not immediately drop to zero because

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

Exam 9: Alternating-Current Circuits

A heater is plugged into the same 120-V AC outlet as an 800-W hair dryer. If the total rms current drawn is 16.7 A, then calculate the power rating of the heater.

Use the following figure to answer the next problem: -The diagram that correctly represents the phase relationship between the current through the resistor and the voltage across the inductor in a circuit containing an inductor L, a capacitor C, and a resistor R all connected in series is

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 Ω\OmegaΩ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The resonant frequency f0 of this circuit is

You connect a 100- Ω\OmegaΩ resistor, a 800-mH inductor, and a 10.0- μ\muμ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The approximate resonant frequency of your circuit is

You connect a 250- Ω\OmegaΩ resistor, a 1.20-mH inductor, and a 1.80-F μ\muμ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The resonant frequency of your circuit is approximately

An inductor with inductance L = 10 mH is connected to a power supply which provides a current I = 5 mA sin ω \omega ω t. The maximum back EMF is

You connect a 50.0- Ω\OmegaΩ resistor, a 2.40-mH inductor, and a 5.60-pF capacitor in series across a 60.0-Hz, 120-V (peak) source. The Q factor for this circuit is approximately

You have a 30-µH inductor and want to form a 1.0-MHz parallel, resonant circuit. You need a capacitor of

Use the following figure for the next three problems. -The figure shows the voltage and current for a(n)

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 Ω\OmegaΩ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The maximum current Im at resonance is

An inductor is placed across an AC generator that has a maximum EMF of 170 V. For a frequency of 3000 Hz, the rms current through the inductor is 5.0 A. Find the value of the inductor.

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are Vrms = 12 V, L = 5.0 mH, C = 4.0 μ\muμ F, and R = 10 Ω\OmegaΩ . Under steady-state conditions, the rms current in the circuit will be

At what frequency is the reactance of a 2-mH inductor equal to the reactance of a 100-pF capacitor?

A 10-mH inductor has an internal resistance of 10 Ω\OmegaΩ . The impedance of this inductor for a frequency of 60 Hz is approximately

As the frequency in this simple AC circuit increases, the rms current through the resistor

What is the resistance of a regular 75-W light bulb connected to a 120-V AC outlet?

A 5-µF capacitor is charged to 30 V and is then connected across a 10-µH inductor. The maximum current in this circuit after a long time has passed will be

When you close the switch S in the figure, the potential between A and B drops to zero. The current in the top loop does not immediately drop to zero because

The Electric Field I: Discrete Charge Distributions

The Electric Field II: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 $\Omega$ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The resonant frequency f₀ of this circuit is

You connect a 100- $\Omega$ resistor, a 800-mH inductor, and a 10.0- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The approximate resonant frequency of your circuit is

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80-F $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. The resonant frequency of your circuit is approximately

An inductor with inductance L = 10 mH is connected to a power supply which provides a current I = 5 mA sin $\omega$ t. The maximum back EMF is

You connect a 50.0- $\Omega$ resistor, a 2.40-mH inductor, and a 5.60-pF capacitor in series across a 60.0-Hz, 120-V (peak) source. The Q factor for this circuit is approximately

A series RLC circuit with L = 5 H, C = 10 µF, and R = 10 $\Omega$ is driven by a generator with a maximum EMF of 100 V and a variable frequency. The maximum current I_m at resonance is

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are V_rms = 12 V, L = 5.0 mH, C = 4.0 $\mu$ F, and R = 10 $\Omega$ . Under steady-state conditions, the rms current in the circuit will be

A 10-mH inductor has an internal resistance of 10 $\Omega$ . The impedance of this inductor for a frequency of 60 Hz is approximately