Exam 22: Reflection and Refraction of Light: Part A

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Transmitting power at high voltage,e.g. ,400,000 V,reduces the power loss for transmission lines.But such a voltage would destroy electrical devices in household use.How then can such 400,000 V electricity be used in a normal house?

(Multiple Choice)

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Question 21

An AC series circuit contains a resistor of 20 Ω,an inductor of 50 mH,and a variable capacitor.If the frequency of the applied voltage is 500 Hz,to what setting should the capacitor be set if resonance is achieved?

(Multiple Choice)

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Question 22

In an RL circuit,which of the following is a possible magnitude of a phase angle?

(Multiple Choice)

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Question 23

An AC voltage source,with a peak output of 120 V,results in dissipation of energy in a resistor at rate of 50.0 W.What is the value of the resistance?

(Multiple Choice)

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Question 24

An AC power generator produces 100 A (rms)at 3600 V.The voltage is stepped up to 100,000 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 25

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 26

A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil.If the current in the secondary is 3.00 A,what is the primary current?

(Multiple Choice)

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Question 27

Consider an AC series circuit containing a coil,capacitor,and resistor.Doubling the frequency will change the inductive reactance by what factor?

(Multiple Choice)

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Question 28

The frequency in an AC series circuit is halved.By what factor does this change the capacitive reactance?

(Multiple Choice)

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Question 29

If the rotating coil used in a generator has its radius doubled,what change results in the amplitude of the voltage produced?

(Multiple Choice)

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Question 30

An AC voltage source,with a peak output of 200 V,is connected to a 25-Ω resistor.What is the rate of energy dissipated due to heat in the resistor?

(Multiple Choice)

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Question 31

In an LCR series circuit the capacitive reactance is 24 Ω.If the AC frequency halves,what will be the resulting capacitive reactance?

(Multiple Choice)

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Question 32

The peak voltage of an AC source is 400 V.What is the rms voltage?

(Multiple Choice)

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Question 33

Find the resonant frequency for a series LCR circuit where R = 20.0 Ω,C = 10.0 µF,and L = 8.0 mH.

(Multiple Choice)

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Question 34

When a 50-μF capacitor is attached to an AC source,its capacitive reactance is 60 Ω.If instead a 200-μF capacitor is attached to the same source,what will be its capacitive reactance?

(Multiple Choice)

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Question 35

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 36

In an AC series circuit the inductive reactance is 150 Ω and the frequency is 100 Hz.What is the inductance in the circuit?

(Multiple Choice)

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Question 37

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 38

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 39

An AC series circuit has 8.00-Ω resistance,15.00-Ω inductive reactance,and 10.00-Ω capacitive reactance.If an effective (rms)emf of 120 V is applied,what is the effective (rms)current value?

(Multiple Choice)

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Question 40

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Exam 22: Reflection and Refraction of Light: Part A

Transmitting power at high voltage,e.g. ,400,000 V,reduces the power loss for transmission lines.But such a voltage would destroy electrical devices in household use.How then can such 400,000 V electricity be used in a normal house?

An AC series circuit contains a resistor of 20 Ω,an inductor of 50 mH,and a variable capacitor.If the frequency of the applied voltage is 500 Hz,to what setting should the capacitor be set if resonance is achieved?

In an RL circuit,which of the following is a possible magnitude of a phase angle?

An AC voltage source,with a peak output of 120 V,results in dissipation of energy in a resistor at rate of 50.0 W.What is the value of the resistance?

An AC power generator produces 100 A (rms)at 3600 V.The voltage is stepped up to 100,000 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?

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

A transformer consists of a 1000-turn primary coil and a 4000-turn secondary coil.If the current in the secondary is 3.00 A,what is the primary current?

Consider an AC series circuit containing a coil,capacitor,and resistor.Doubling the frequency will change the inductive reactance by what factor?

The frequency in an AC series circuit is halved.By what factor does this change the capacitive reactance?

If the rotating coil used in a generator has its radius doubled,what change results in the amplitude of the voltage produced?

An AC voltage source,with a peak output of 200 V,is connected to a 25-Ω resistor.What is the rate of energy dissipated due to heat in the resistor?

In an LCR series circuit the capacitive reactance is 24 Ω.If the AC frequency halves,what will be the resulting capacitive reactance?

The peak voltage of an AC source is 400 V.What is the rms voltage?

Find the resonant frequency for a series LCR circuit where R = 20.0 Ω,C = 10.0 µF,and L = 8.0 mH.

When a 50-μF capacitor is attached to an AC source,its capacitive reactance is 60 Ω.If instead a 200-μF capacitor is attached to the same source,what will be its capacitive reactance?

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

In an AC series circuit the inductive reactance is 150 Ω and the frequency is 100 Hz.What is the inductance in the circuit?

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?

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?

An AC series circuit has 8.00-Ω resistance,15.00-Ω inductive reactance,and 10.00-Ω capacitive reactance.If an effective (rms)emf of 120 V is applied,what is the effective (rms)current value?

Introduction

Introduction: Part A

Motion in One Dimension

Motion in One Dimension: Part A

Vectors and Two-Dimensional Motion

Vectors and Two-Dimensional Motion: Part A

The Laws of Motion

The Laws of Motion: Part A

Energy

Energy: Part A

Momentum and Collisions

Momentum and Collisions: Part A

Rotational Motion and the Law of Gravity

Rotational Motion and the Law of Gravity: Part A

Rotational Equilibrium and Rotational Dynamics

Rotational Equilibrium and Rotational Dynamics: Part A

Solids and Fluids

Solids and Fluids: Part A

Thermal Physics

Thermal Physics: Part A

Energy in Thermal Processes Heat and Internal Energy

Energy in Thermal Processes Heat and Internal Energy: Part A

The Laws of Thermodynamics Work in Thermodynamic Processes

The Laws of Thermodynamics Work in Thermodynamic Processes: Part A

Vibrations and Waves

Vibrations and Waves: Part A

Sound

Sound: Part A

Electric Forces and Electric Fields

Electric Forces and Electric Fields: Part A

Electrical Energy and Capacitance

Electrical Energy and Capacitance: Part A

Current and Resistance Electric Current

Current and Resistance Electric Current: Part A

Direct-Current Circuits Sources of EMF

Direct-Current Circuits Sources of EMF: Part A

Magnetism Magnets

Magnetism Magnets: Part A

Induced Voltages and Inductance

Induced Voltages and Inductance: Part A

Alternating-Current Circuits and Electromagnetic Waves

Alternating-Current Circuits and Electromagnetic Waves: Part A

Reflection and Refraction of Light

Mirrors and Lenses

Mirrors and Lenses: Part A

Wave Optics

Wave Optics: Part A

Optical Instruments

Optical Instruments: Part A

Relativity

Relativity: Part A

Quantum Physics Blackbody Radiation and Plancks Hypothesis

Quantum Physics Blackbody Radiation and Plancks Hypothesis: Part A

Atomic Physics

Atomic Physics: Part A

Nuclear Physics

Nuclear Physics: Part A

Nuclear Energy and Elementary Particles

Nuclear Energy and Elementary Particles: Part A

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?