Question 1

You have a 30-µH inductor and a 50-µF capacitor with which you form a parallel, resonant circuit. The frequency of this circuit will be

Accepted Answer

A)  4.11 kHz 
B)  13.7 kHz 
C)  25.8 kHz 
D)  31.7 kHz 
E)  39.1 kHz 
A)  4.11 kHz 
B)  13.7 kHz 
C)  25.8 kHz 
D)  31.7 kHz 
E)  39.1 kHz

Question 2

A transformer is used to change

Accepted Answer

A)  capacitance. 
B)  frequency. 
C)  voltage. 
D)  power. 
E)  None of these is correct. 
A)  capacitance. 
B)  frequency. 
C)  voltage. 
D)  power. 
E)  None of these is correct.

Question 3

You connect a 250-$\Omega$ resistor, a 1.20-mH inductor, and a 1.80-$\mu$F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the capacitor in this circuit, the meter reads approximately

Accepted Answer

A)  25.7 mV 
B)  83.6 V 
C)  120 V 
D)  14.2 V 
E)  84.9 V 
A)  25.7 mV 
B)  83.6 V 
C)  120 V 
D)  14.2 V 
E)  84.9 V

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 impedance of the circuit?

Accepted Answer

A)  36  $\Omega$ 
B)  43.9  $\Omega$ 
C)  200  $\Omega$ 
D)  236  $\Omega$ 
E)  None of these is correct. 
A)  36  $\Omega$ 
B)  43.9  $\Omega$ 
C)  200  $\Omega$ 
D)  236  $\Omega$ 
E)  None of these is correct.

Question 5

If you were to plug a 1200-W heater and a 600-W toaster into a 110-V electrical outlet, what total rms current would these two appliances draw if the wiring is parallel?

Accepted Answer

A)  5.45 A 
B)  10.9 A 
C)  11.6 A 
D)  16.4 A 
E)  23.1 A 
A)  5.45 A 
B)  10.9 A 
C)  11.6 A 
D)  16.4 A 
E)  23.1 A

Question 6

A 5-µF capacitor is charged to 30 V and is then connected in series with a 10-µH inductor and a 50-$\Omega$resistor. The potential difference across the capacitor after a long time has passed will be

Accepted Answer

A)  0 
B)  7 V 
C)  15 V 
D)  30 V 
E)  some value that cannot be determined from the given information. 
A)  0 
B)  7 V 
C)  15 V 
D)  30 V 
E)  some value that cannot be determined from the given information.

Question 7

Use the following figure for the next two problems.  
-The figure shows the voltage and current for a device. The average power consumed by the device is

Accepted Answer

A)  2 W 
B)  0.6 W 
C)  1.2 W 
D)  0.3 W 
E)  2.4 W 
A)  2 W 
B)  0.6 W 
C)  1.2 W 
D)  0.3 W 
E)  2.4 W

Question 8

Which of the following statements about an inductor that is connected to an AC voltage is true?

Accepted Answer

A)  The average power dissipated by the inductor is zero. 
B)  At low frequencies the inductor behaves like a short circuit. 
C)  At high frequencies the inductor behaves like an open short circuit. 
D)  The back EMF produced by the inductor is the maximum when the voltage is at zero part of the cycle. 
E)  All the above statements are true. 
A)  The average power dissipated by the inductor is zero. 
B)  At low frequencies the inductor behaves like a short circuit. 
C)  At high frequencies the inductor behaves like an open short circuit. 
D)  The back EMF produced by the inductor is the maximum when the voltage is at zero part of the cycle. 
E)  All the above statements are true.

Question 9

How much does the maximum EMF produced by a generator (a rotating coil) change if the area of the coil is doubled and the angular frequency halved?

Accepted Answer

A)  it is the same 
B)  it is increased by a factor of two 
C)  it is increased by a factor of eight 
D)  it is decreased by a factor of four 
E)  it is impossible to tell given the information provided 
A)  it is the same 
B)  it is increased by a factor of two 
C)  it is increased by a factor of eight 
D)  it is decreased by a factor of four 
E)  it is impossible to tell given the information provided

Question 10

A 500-W toaster is plugged into a 120-V AC outlet. What is the peak current in the toaster?

Accepted Answer

A)  0.24 A 
B)  4.2 A 
C)  2.9 A 
D)  0.34 A 
E)  5.9 A 
A)  0.24 A 
B)  4.2 A 
C)  2.9 A 
D)  0.34 A 
E)  5.9 A

Question 11

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 capACitor 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 12

How much does the maximum EMF produced by a generator (a rotating coil) change if the number of turns of the coil is tripled?

Accepted Answer

A)  it is the same 
B)  it is tripled 
C)  it is increased by a fACtor of nine 
D)  it is reduced by one-third 
E)  it is impossible to tell given the information provided 
A)  it is the same 
B)  it is tripled 
C)  it is increased by a fACtor of nine 
D)  it is reduced by one-third 
E)  it is impossible to tell given the information provided

Question 13

You connect a 250-$\Omega$ resistor, a 1.20-mH inductor, and a 1.80-$\mu$F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the resistor in this circuit, the meter reads approximately

Accepted Answer

A)  25.7 mV 
B)  83.6 V 
C)  120 V 
D)  14.2 V 
E)  84.9 V 
A)  25.7 mV 
B)  83.6 V 
C)  120 V 
D)  14.2 V 
E)  84.9 V

Question 14

At what frequency is the reACtance of a 3.5-mH inductor equal to 10.0 $\Omega$?

Accepted Answer

A)  1.45 kHz 
B)  1.05 kHz 
C)  0.865 kHz 
D)  0.455 kHz 
E)  0.234 kHz 
A)  1.45 kHz 
B)  1.05 kHz 
C)  0.865 kHz 
D)  0.455 kHz 
E)  0.234 kHz

Question 15

Most calculators operate on 6.0 V. If, instead of using batteries, you obtain 6.0 V from a transformer plugged into 110-V house wiring, what must the ratio of the primary to the secondary turns be in the transformer? (Ignore any changes in voltage due to rectification.)

Accepted Answer

A)  0.054 
B)  18 
C)  660 
D)  0.066 
E)  15 
A)  0.054 
B)  18 
C)  660 
D)  0.066 
E)  15

Question 16

An AC power supply, V = Vo sin $ \omega $t, is connected in series to an inductor, capacitor, and resistor. The sum of the peak voltages across the inductor, capacitor and resistor is

Accepted Answer

A)  always equal to Vo. 
B)  always less than Vo. 
C)  always greater than Vo. 
D)  not possible to determine. 
E)  none of the above 
A)  always equal to Vo. 
B)  always less than Vo. 
C)  always greater than Vo. 
D)  not possible to determine. 
E)  none of the above

Question 17

The approximate rms current in the circuit shown is

Accepted Answer

A)  2 A 
B)  2.82 A 
C)  1.41 A 
D)  0.56 A 
E)  None of these is correct. 
A)  2 A 
B)  2.82 A 
C)  1.41 A 
D)  0.56 A 
E)  None of these is correct.

Question 18

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 $\mu$F, R = 10 $\Omega$. What is the impedance of this circuit?

Accepted Answer

A)  8.4 $\Omega$ 
B)  10 $\Omega$ 
C)  13 $\Omega$ 
D)  0.24 k$\Omega$ 
E)  81 $\Omega$ 
A)  8.4 $\Omega$ 
B)  10 $\Omega$ 
C)  13 $\Omega$ 
D)  0.24 k$\Omega$ 
E)  81 $\Omega$

Question 19

The approximate resonant frequency of the circuit shown is

Accepted Answer

A)  1.5 kHz 
B)  0.25 kHz 
C)  2.4 MHz 
D)  25 kHz 
E)  None of these is correct. 
A)  1.5 kHz 
B)  0.25 kHz 
C)  2.4 MHz 
D)  25 kHz 
E)  None of these is correct.

Question 20

At what frequency is the reACtance of a 1.5-mH inductor equal to 5.0 $\Omega$0?

Accepted Answer

A)  0.53 kHz 
B)  0.13 kHz 
C)  3.3 kHz 
D)  21 Hz 
E)  21 kHz 
A)  0.53 kHz 
B)  0.13 kHz 
C)  3.3 kHz 
D)  21 Hz 
E)  21 kHz

You have a 30-µH inductor and a 50-µF capacitor with which you form a parallel, resonant circuit. The frequency of this circuit will be

A transformer is used to change

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the capacitor in this circuit, the meter reads approximately

If you were to plug a 1200-W heater and a 600-W toaster into a 110-V electrical outlet, what total rms current would these two appliances draw if the wiring is parallel?

A 5-µF capacitor is charged to 30 V and is then connected in series with a 10-µH inductor and a 50- $\Omega$ resistor. The potential difference across the capacitor after a long time has passed will be

Use the following figure for the next two problems. -The figure shows the voltage and current for a device. The average power consumed by the device is

Which of the following statements about an inductor that is connected to an AC voltage is true?

How much does the maximum EMF produced by a generator (a rotating coil) change if the area of the coil is doubled and the angular frequency halved?

A 500-W toaster is plugged into a 120-V AC outlet. What is the peak current in the toaster?

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 capACitor in a circuit containing an inductor L, a capACitor C, and a resistor R all connected in series is

How much does the maximum EMF produced by a generator (a rotating coil) change if the number of turns of the coil is tripled?

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the resistor in this circuit, the meter reads approximately

At what frequency is the reACtance of a 3.5-mH inductor equal to 10.0 $\Omega$ ?

Most calculators operate on 6.0 V. If, instead of using batteries, you obtain 6.0 V from a transformer plugged into 110-V house wiring, what must the ratio of the primary to the secondary turns be in the transformer? (Ignore any changes in voltage due to rectification.)

An AC power supply, V = V_o sin $\omega$ t, is connected in series to an inductor, capacitor, and resistor. The sum of the peak voltages across the inductor, capacitor and resistor is

The approximate rms current in the circuit shown is

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 $\mu$ F, R = 10 $\Omega$ . What is the impedance of this circuit?

The approximate resonant frequency of the circuit shown is

At what frequency is the reACtance of a 1.5-mH inductor equal to 5.0 $\Omega$ 0?

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

You have a 30-µH inductor and a 50-µF capacitor with which you form a parallel, resonant circuit. The frequency of this circuit will be

A transformer is used to change

You connect a 250- Ω\OmegaΩ resistor, a 1.20-mH inductor, and a 1.80- μ\muμ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the capacitor in this circuit, the meter reads approximately

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

If you were to plug a 1200-W heater and a 600-W toaster into a 110-V electrical outlet, what total rms current would these two appliances draw if the wiring is parallel?

A 5-µF capacitor is charged to 30 V and is then connected in series with a 10-µH inductor and a 50- Ω\OmegaΩ resistor. The potential difference across the capacitor after a long time has passed will be

Use the following figure for the next two problems. -The figure shows the voltage and current for a device. The average power consumed by the device is

Which of the following statements about an inductor that is connected to an AC voltage is true?

How much does the maximum EMF produced by a generator (a rotating coil) change if the area of the coil is doubled and the angular frequency halved?

A 500-W toaster is plugged into a 120-V AC outlet. What is the peak current in the toaster?

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 capACitor in a circuit containing an inductor L, a capACitor C, and a resistor R all connected in series is

How much does the maximum EMF produced by a generator (a rotating coil) change if the number of turns of the coil is tripled?

You connect a 250- Ω\OmegaΩ resistor, a 1.20-mH inductor, and a 1.80- μ\muμ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the resistor in this circuit, the meter reads approximately

At what frequency is the reACtance of a 3.5-mH inductor equal to 10.0 Ω\OmegaΩ ?

Most calculators operate on 6.0 V. If, instead of using batteries, you obtain 6.0 V from a transformer plugged into 110-V house wiring, what must the ratio of the primary to the secondary turns be in the transformer? (Ignore any changes in voltage due to rectification.)

An AC power supply, V = Vo sin ω \omega ω t, is connected in series to an inductor, capacitor, and resistor. The sum of the peak voltages across the inductor, capacitor and resistor is

The approximate rms current in the circuit shown is

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 μ\muμ F, R = 10 Ω\OmegaΩ . What is the impedance of this circuit?

The approximate resonant frequency of the circuit shown is

At what frequency is the reACtance of a 1.5-mH inductor equal to 5.0 Ω\OmegaΩ 0?

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

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the capacitor in this circuit, the meter reads approximately

A 5-µF capacitor is charged to 30 V and is then connected in series with a 10-µH inductor and a 50- $\Omega$ resistor. The potential difference across the capacitor after a long time has passed will be

You connect a 250- $\Omega$ resistor, a 1.20-mH inductor, and a 1.80- $\mu$ F capacitor in series across a 60.0-Hz, 120-V (peak) source. When you connect a voltmeter across the resistor in this circuit, the meter reads approximately

At what frequency is the reACtance of a 3.5-mH inductor equal to 10.0 $\Omega$ ?

An AC power supply, V = V_o sin $\omega$ t, is connected in series to an inductor, capacitor, and resistor. The sum of the peak voltages across the inductor, capacitor and resistor is

A series RLC circuit is driven by a 1.0-kHz oscillator. The circuit parameters are L = 5.0 mH, C = 4.0 $\mu$ F, R = 10 $\Omega$ . What is the impedance of this circuit?

At what frequency is the reACtance of a 1.5-mH inductor equal to 5.0 $\Omega$ 0?