An electromagnetic wave with a peak magnetic field component of 3.20 × 10−7 T carries what average power per unit area? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2 and c = 3.00 × 108 m/s)

A) 38.4 W/m2 B) 24.4 W/m2 C) 12.2 W/m2 D) 3.82 W/m2 E) 7.64 W/m2 A) 38.4 W/m2 B) 24.4 W/m2 C) 12.2 W/m2 D) 3.82 W/m2 E) 7.64 W/m2

Exam 21: Alternating-Current Circuits and Electromagnetic Waves

A 58-Ω resistor,a 0.40-H inductor,and a 10.0-µF capacitor are connected in series to a 106-Hz source.The rms current in the circuit is 3.99 A.Find the rms voltage across the resistor,the inductor,and the capacitor.

(Multiple Choice)

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Question 61

In a capacitor in an AC circuit,the voltage:

(Multiple Choice)

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Question 62

A radar pulse sent out to an airplane at a distance of 24.9 km will return as an echo to the source in what time interval? (c = 3.00 × 10⁸ m/s)

(Multiple Choice)

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Question 63

A circuit consists of an AC audio amplifier,a resistor,and a speaker,all in series.The amplifier puts out an alternating voltage of 16.0 V (rms),the resistance of the resistor is 10.0 Ω,and the speaker has a resistance of 11.9 Ω.What is the time-averaged power delivered to the speaker?

(Multiple Choice)

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Question 64

An electromagnetic wave with a peak magnetic field component of 3.20 × 10−⁷ T carries what average power per unit area? (μ₀ = 4π × 10−⁷ T⋅m/A,ε₀ = 8.85 × 10−¹² C²/N⋅m² and c = 3.00 × 10⁸ m/s)

(Multiple Choice)

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Question 65

An electric motor produces 2.0 hp in a V_rms = 120 V circuit.What is I_rms for this motor? (1 hp = 746 W)

(Multiple Choice)

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Question 66

Which one of the following scientists made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?

(Multiple Choice)

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Question 67

In some countries the AC frequency is 50 Hz.What is the time interval for one cycle at this frequency?

(Multiple Choice)

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Question 68

Microwave radiation is useful in which of the following?

(Multiple Choice)

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Question 69

In an AC series circuit,the current in a pure resistor differs in phase with the applied voltage by what angle?

(Multiple Choice)

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Question 70

An LCR circuit has resistance R₀,inductance L₀,and capacitance C₀.If the resistance value is now tripled,which values of inductance and capacitance will result in the same resonant frequency as before?

(Multiple Choice)

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Question 71

The current in an inductor connected to an AC voltage source lags the voltage.This lag is caused by the:

(Multiple Choice)

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Question 72

In the inductor of a 59-Hz AC series circuit,the peak voltage precedes the peak current in each cycle by what time interval?

(Multiple Choice)

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Question 73

Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?

(Multiple Choice)

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Question 74

At what frequency does a 0.32-H inductor have the same reactance as a 0.22-μF capacitor?

(Multiple Choice)

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Question 75

An FM radio tuning circuit has a coil with an inductance of 0.0036 mH.What is the value of the capacitance if the set is tuned to 91.3 MHz?

(Multiple Choice)

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Question 76

The peak voltage of an AC source is 296 V.What is the rms voltage?

(Multiple Choice)

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Question 77

An AC power generator produces 42.9 A (rms)at 2 970 V.The voltage is stepped up to 6 000 V by an ideal transformer,and the energy transmitted through a long-distance power line with a total resistance of 100 Ω.What is the rms current in the long-distance line?

(Multiple Choice)

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Question 78

An AC circuit consists of a 60-Hz source,a 200-Ω resistor,and a 1.06-H inductor,all in series.What is the impedance of this circuit?

(Multiple Choice)

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Question 79

A series RLC AC circuit is at resonance.It contains a resistor of 18.7 Ω,a capacitor of 0.460 μF and an inductor of 70.9 mH.If an effective (rms)voltage of 41.0 V is applied,what is the effective (rms)current when the circuit is in resonance?

(Multiple Choice)

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Question 80

Showing 61 - 80 of 122

Exam 21: Alternating-Current Circuits and Electromagnetic Waves

A 58-Ω resistor,a 0.40-H inductor,and a 10.0-µF capacitor are connected in series to a 106-Hz source.The rms current in the circuit is 3.99 A.Find the rms voltage across the resistor,the inductor,and the capacitor.

In a capacitor in an AC circuit,the voltage:

A radar pulse sent out to an airplane at a distance of 24.9 km will return as an echo to the source in what time interval? (c = 3.00 × 108 m/s)

​A circuit consists of an AC audio amplifier,a resistor,and a speaker,all in series.The amplifier puts out an alternating voltage of 16.0 V (rms),the resistance of the resistor is 10.0 Ω,and the speaker has a resistance of 11.9 Ω.What is the time-averaged power delivered to the speaker?

An electromagnetic wave with a peak magnetic field component of 3.20 × 10−7 T carries what average power per unit area? (μ0 = 4π × 10−7 T⋅m/A,ε0 = 8.85 × 10−12 C2/N⋅m2 and c = 3.00 × 108 m/s)

An electric motor produces 2.0 hp in a Vrms = 120 V circuit.What is Irms for this motor? (1 hp = 746 W)

Which one of the following scientists made the theoretical prediction that electromagnetic waves travel through a vacuum at the speed of light?

In some countries the AC frequency is 50 Hz.What is the time interval for one cycle at this frequency?

Microwave radiation is useful in which of the following?

In an AC series circuit,the current in a pure resistor differs in phase with the applied voltage by what angle?

An LCR circuit has resistance R0,inductance L0,and capacitance C0.If the resistance value is now tripled,which values of inductance and capacitance will result in the same resonant frequency as before?

The current in an inductor connected to an AC voltage source lags the voltage.This lag is caused by the:

In the inductor of a 59-Hz AC series circuit,the peak voltage precedes the peak current in each cycle by what time interval?

Which condition of motion must be met with regard to a charged particle if it is in the process of emitting electromagnetic radiation?

At what frequency does a 0.32-H inductor have the same reactance as a 0.22-μF capacitor?

An FM radio tuning circuit has a coil with an inductance of 0.0036 mH.What is the value of the capacitance if the set is tuned to 91.3 MHz?

The peak voltage of an AC source is 296 V.What is the rms voltage?

An AC power generator produces 42.9 A (rms)at 2 970 V.The voltage is stepped up to 6 000 V by an ideal transformer,and the energy transmitted through a long-distance power line with a total resistance of 100 Ω.What is the rms current in the long-distance line?

An AC circuit consists of a 60-Hz source,a 200-Ω resistor,and a 1.06-H inductor,all in series.What is the impedance of this circuit?

A series RLC AC circuit is at resonance.It contains a resistor of 18.7 Ω,a capacitor of 0.460 μF and an inductor of 70.9 mH.If an effective (rms)voltage of 41.0 V is applied,what is the effective (rms)current when the circuit is in resonance?

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A radar pulse sent out to an airplane at a distance of 24.9 km will return as an echo to the source in what time interval? (c = 3.00 × 10⁸ m/s)

A circuit consists of an AC audio amplifier,a resistor,and a speaker,all in series.The amplifier puts out an alternating voltage of 16.0 V (rms),the resistance of the resistor is 10.0 Ω,and the speaker has a resistance of 11.9 Ω.What is the time-averaged power delivered to the speaker?

An electromagnetic wave with a peak magnetic field component of 3.20 × 10−⁷ T carries what average power per unit area? (μ₀ = 4π × 10−⁷ T⋅m/A,ε₀ = 8.85 × 10−¹² C²/N⋅m² and c = 3.00 × 10⁸ m/s)

An electric motor produces 2.0 hp in a V_rms = 120 V circuit.What is I_rms for this motor? (1 hp = 746 W)

An LCR circuit has resistance R₀,inductance L₀,and capacitance C₀.If the resistance value is now tripled,which values of inductance and capacitance will result in the same resonant frequency as before?