College Physics 1st Edition
ISBN: 9781938168000
Author: Paul Peter Urone, Roger Hinrichs
Publisher: Paul Peter Urone, Roger Hinrichs
1 Introduction: The Nature Of Science And Physics 2 Kinematics 3 Two-dimensional Kinematics 4 Dynamics: Force And Newton's Laws Of Motion 5 Further Applications Of Newton's Laws: Friction, Drag, And Elasticity 6 Uniform Circular Motion And Gravitation 7 Work, Energy, And Energy Resources 8 Linear Momentum And Collisions 9 Statics And Torque 10 Rotational Motion And Angular Momentum 11 Fluid Statics 12 Fluid Dynamics And Its Biological And Medical Applications 13 Temperature, Kinetic Theory, And The Gas Laws 14 Heat And Heat Transfer Methods 15 Thermodynamics 16 Oscillatory Motion And Waves 17 Physics Of Hearing 18 Electric Charge And Electric Field 19 Electric Potential And Electric Field 20 Electric Current, Resistance, And Ohm's Law 21 Circuits And Dc Instruments 22 Magnetism 23 Electromagnetic Induction, Ac Circuits, And Electrical Technologies 24 Electromagnetic Waves 25 Geometric Optics 26 Vision And Optical Instruments 27 Wave Optics 28 Special Relativity 29 Introduction To Quantum Physics 30 Atomic Physics 31 Radioactivity And Nuclear Physics 32 Medical Applications Of Nuclear Physics 33 Particle Physics 34 Frontiers Of Physics Chapter23: Electromagnetic Induction, Ac Circuits, And Electrical Technologies
Chapter Questions Section: Chapter Questions
Problem 1CQ: How do the multiple-loop coils and iron ring in the version of Faraday's apparatus shown in Figure... Problem 2CQ: When a magnet is thrust into a coil as in Figure 23.4(a), what is the direction of the louse exerted... Problem 3CQ: Explain how magnetic flux can be zero when the magnetic field is not zero. Problem 4CQ: Is an emf induced in the coil in Figure 23.54 when it is stretched? If so, state why and give the... Problem 5CQ: A person who works with large magnets sometimes places her head inside a strong field. She reports... Problem 6CQ: A particle accelerator sends highvelocity charged particles down an evacuated pipe. Explain how a... Problem 7CQ: Why must pan of the circuit be moving relative to other parts, to have usable motional emf?... Problem 8CQ: A powerful induction cannon can be made by placing a metal cylinder inside a solenoid coil. The... Problem 9CQ: An induction slave heats a pot with a coil carrying an alternating current located beneath the pot... Problem 10CQ: Explain how you could thaw out a frozen water pipe by wrapping a coil carrying an alternating... Problem 11CQ: Explain why magnetic damping might not be effective on an object made of several thin conducting... Problem 12CQ: Explain how electromagnetic induction can be used to detect metals? This technique is particularly... Problem 13CQ: Using RHR-l, show that the emfs in the sides of the generator loop in Figure 23.23 are in the same... Problem 14CQ: The source of a generator’s electrical energy output is the work done to turn its coils. How is the... Problem 15CQ: Suppose you find that the belt drive connecting a powerful motor to an air conditioning unit is... Problem 16CQ: Explain what causes physical vibrations in transformers at twice the frequency of the AC power... Problem 17CQ: Does plastic insulation on live/hot wires prevent shock hazards, thermal hazards, or both? Problem 18CQ: Why are ordinary circuit breakers and fuses ineffective in preventing shocks? Problem 19CQ: A GFI may trip just because the live/hot and neutral wires connected to it are significantly... Problem 20CQ: How would you place two identical flat coils in contact so that they had the greatest mutual... Problem 21CQ: How would you shape a given length of wire to give it the greatest self-inductance? The least? Problem 22CQ: €22. Verify, as was concluded without proof in Example 23.7, that units of Problem 23CQ: Presbycusis is a hearing loss due to age that progressively affects higher frequencies. A hearing... Problem 24CQ: Would you use a large inductance or a large capacitance in series with a system to filter out low... Problem 25CQ: High-frequency noise in AC power can damage computers. Does the plug-in unit designed to prevent... Problem 26CQ: Does inductance depend on current, frequency, or both? What about inductive reactance? Problem 27CQ: Explain why the capacitor in Figure 23.55(a) acts as a low-frequency filter between the two... Problem 28CQ: If the capacitors in Figure 23.55 are replaced by inductors, which acts as a low-frequency fitter... Problem 29CQ: Does the resonant frequency of an AC circuit depend on the peak voltage of the AC source? Explain... Problem 30CQ: Suppose you have a motor with a power factor significantly less than 1. Explain why it would be... Problem 1PE: What is the value of the magnetic flux at coil 2 in Figure 23.56 due to coil 1? Figure 23.56 (a) The... Problem 2PE: What is the value of the magnetic flux through the coil in Figure 23.56 (b) due to the wire? Problem 3PE: Referring to Figure 23.5?(a), what is the direction of the current induced in coil 2: (a) If the... Problem 4PE: Referring to Figure 23.57(b), what is the direction of the current induced in the coil: (a) If the... Problem 5PE: Referring to Figure 23.58, what are the directions of the currents in coils 1, 2, and 3 (assume that... Problem 6PE: Repeat the previous problem with the battery reversed. Problem 7PE: Verify that the units /t are volts. That is, show that 1 T (m2/s = 1 V. Problem 8PE: Suppose a 50-turn coil lies in the plane of the page in a uniform magnetic field that is directed... Problem 9PE: (a) An MRI technician moves his hand from a region of very low magnetic field strength into an MRI... Problem 10PE: Integrated Concepts Referring to the situation in the previous problem: (a) What current is induced... Problem 11PE: An emf is induced by rotating a 1000-turn, 20.0 cm diameter coil in the Earth’s 5.00105T magnetic... Problem 12PE: A 0.250 m radius, 500-turn coil is rotated one-fourth of a revolution in 4.17 ms, originally having... Problem 13PE: Integrated Concepts Approximately how does the emf induced in the loop in Figure 23.57(b) depend on... Problem 14PE: Integrated Concepts A lightning bolt produces a rapidly varying magnetic field. It the belt strikes... Problem 15PE: Use Faraday’s law, Lenz’s law, and RHR—l to show that the magnetic force on the current in the... Problem 16PE: If a current flows in the Satellite Tether shown in Figure 23.12, use Faraday’s law, Lenz'S law, and... Problem 17PE: (a) A jet airplane with a 75.0 m wingspan is flying at 280 m/s. What emf is induced between wing... Problem 18PE: (a) A nonferrous screwdriver is being used in a 2.00 T magnetic field. What maximum emf can be... Problem 19PE: At what speed must the sliding rod in Figure 23.11 move to produce an emf of 1.00 V in a 1.50 T... Problem 20PE: The 12.0 cm long rod in Figure 23.11 moves at 4.00 m/s. What is the strength of the magnetic field... Problem 21PE: Prove that when B, l, and v are not mutually perpendicular, motional emf is given by emf=Blvsin. If... Problem 22PE: In the August 1992 space shuttle flight, only 250 m of the conducting tether considered in Example... Problem 23PE: Integrated Concepts Derive an expression for the current in a system like that in Figure 23.11,... Problem 24PE: Integrated Concepts The Tethered Satellite in Figure 23.12 has a mass at 525 kg and is at the end of... Problem 25PE: Integrated Concepts The Tethered Satellite discussed in this module is producing 5.00 kV, and a... Problem 26PE: Make a drawing similar to Figure 23.14, but with the pendulum moving in the opposite direction. Then... Problem 27PE: Figure 23.59 A coil is moved into and out of a region of uniform magnetic field. A coil is moved... Problem 28PE: Calculate the peak voltage of a generator that rotates its 200-turn, 0.100 m diameter coil at 3600... Problem 29PE: At what angular velocity in rpm will the peak voltage of a generator be 480 V. if its 500-turn, 8.00... Problem 30PE: What is the peak emf generated by rotating a 1000-turn, 20.0 cm diameter coil in the Earth’s... Problem 31PE: What is the peak emf generated by a 0.250 m radius, 500turn coil is rotated one-fourth of a... Problem 32PE: (a) A bicycle generator rotates at 1875 rad/s, producing an 18.0 V peak emf. It has a 1.00 by 3.00... Problem 33PE: Integrated Concepts This problem refers to the bicycle generator considered in the previous problem.... Problem 34PE: (a) A car generator turns at 400 rpm when 1he engine is idling. Its 300-turn, 5.00 by 8.00 cm... Problem 35PE: Show that if a coil rotates at an angular velocity (, the period of its AC output is 2(/(. Problem 36PE: A 75-turn, 10.0 cm diameter coil rotates at an angular velocity of 8.00 radius in a 1.25 T field,... Problem 37PE: (a) If the emf of a coil rotating in a magnetic field is zero at t = 0, and increases to its first... Problem 38PE: Unreasonable Results A 500-turn coil with a 0.250 m2 area is spun in the Earth’s 5.00105T field,... Problem 39PE: Suppose a motor connected to a 120 V source draws 10.0 A when it first starts. (a) What is its... Problem 40PE: A motor operating on 240 V electricity has a 180 V back emf at operating speed and draws a 12.0 A... Problem 41PE: What is the back emf of a 120 V motor that draws 3.00 A at its normal speed and 20.0 A when first... Problem 42PE: The motor in a toy car operates on 6.00 V. developing a 4.50 V back emf at normal speed. If it draws... Problem 43PE: Integrated Concepts The motor in a toy car is powered by four batteries in series, which produce a... Problem 44PE: A plug—in transformer, like that in Figure 23.29, supplies 9.00 V to a video game system. (a) How... Problem 45PE: An American traveler in New Zealand carries a transformer to convert New Zealand’s standard 240 V to... Problem 46PE: A cassette recorder uses a plug-in transformer to convert 120 V to 12.0 V, with a maximum current... Problem 47PE: (a) What is the voltage output of a transformer used for rechargeable flashlight batteries, if its... Problem 48PE: (a) The plug-in transformer for a laptop computer puts out 7.50 V and can supply a maximum current... Problem 49PE: A multipurpose transformer has a secondary coil with several points at which a 1inziltage can be... Problem 50PE: A large power plant generates electricity at 12.0 kV. Its old transformer once converted the voltage... Problem 51PE: If the power output in the previous problem is 1000 MW and line resistance is 2.00 (, what were the... Problem 52PE: Unreasonable Results The 335 kV AC electricity from a power transmission line is fed into the... Problem 53PE: Construct Your Own Problem Consider a double transformer to be used to create very large voltages.... Problem 54PE: Integrated Concepts A short circuit to the grounded metal case of an appliance occurs as shown in... Problem 55PE: Two coils are placed close together in a physics lab to demonstrate Faraday’s law of induction. A... Problem 56PE: If two coils placed next to one another have a mutual inductance at 5.00 mH, what voltage is induced... Problem 57PE: The 4.00 A current through a 7.50 mH inductor is switched off in 8.33 ms. What is the emf induced... Problem 58PE: A device is turned on and 3.00 A flows through it 0.100 ms later. What is the self-inductance of the... Problem 59PE: Starting with emf2=MI1t, show that the units of inductance are (Vs)/A=s. Problem 60PE: Camera flashes charge a capacitor to high voltage by switching the current through an inductor on... Problem 61PE: A large research solenoid has a self-inductance of 25.0 H. (a) What induced emf opposes shutting it... Problem 62PE: (a) Calculate the self-inductance of a 50.0 cm long, 10.0 cm diameter solenoid having 1000 loops.... Problem 63PE: A precision laboratory resistor is made of a coil of wire 1.50 cm in diameter and 4.00 cm long, and... Problem 64PE: The healing coils in a hair dryer are 0.800 cm in diameter, have a combined length of 1.00 m, and a... Problem 65PE: When the 20.0 A current through an inductor is turned off in 1.50 ms, an 800 V emf is induced,... Problem 66PE: How fast can the 150 A current through a 0.250 H inductor be shut off if the induced emf cannot... Problem 67PE: Integrated Concepts A very large, superconducting solenoid such as one used in MRI scene, stores... Problem 68PE: Unreasonable Results A 25.0 H inductor has 100 A of current turned off in 1.00 ms. (a) What voltage... Problem 69PE: It you want a characteristic RL time constant of 1.00 s, and you have a 500 (resistor, what value of... Problem 70PE: Your RL circuit has a characteristic time constant of 20.0 ns, and a resistance of 5.00 M (a) What... Problem 71PE: A large superconducting magnet, used for magnetic resonance imaging, has a 50.0 H inductance. It you... Problem 72PE: Verify that alter a time of 10.0 ms, the current for the situation considered in Example 23.9 will... Problem 73PE: Suppose you have a supply of inductors ranging from 1.00 nH to 10.0 H, and registers ranging from... Problem 74PE: (a) What is the characteristic time constant of a 25.0 mH inductor that has a resistance of 4.00 ?... Problem 75PE: What percentage of the final current I0 flows through an inductor L in series with a resistor R,... Problem 76PE: The 5.00 A current through a 1.50 H inductor is dissipated by a 2.00 ( resistor in a circuit like... Problem 77PE: (a) Use the exact exponential treatment to find how much time is required to bring the current... Problem 78PE: (a) Using the exact exponential treatment, find the time required for the current through a 2.00 H... Problem 79PE: At what frequency will a 30.0 mH inductor have a reactance of 100 ? Problem 80PE: What value of inductance should be used if a 20.0 k(reactance is needed at a frequency of 500 Hz? Problem 81PE: What capacitance should be used to produce a 2.00 M(reactance at 60.0 Hz? Problem 82PE: At what frequency will an 80.0 mF capacitor have a reactance of 0.250 ? Problem 83PE: (a) Find me current through a 0.500 H inductor connected to a 60.0 Hz, 430 V AC source. (b) What... Problem 84PE: (a) What current flows when a 60.0 Hz, 480 V AC source is connected to a 0.250 (F capacitor? (b)... Problem 85PE: A 20.0 kHz, 16.0 V source connected to an inductor produces a 2.00 A current. What is the... Problem 86PE: A 20.0 HZ, 16.0 V source produces a 2.00 mA current when connected to a capacitor. What is the... Problem 87PE: (a) An inductor designed to filter high-frequency noise from power supplied to a personal computer... Problem 88PE: The capacitor in Figure 23.55(a) is designed to filter low—frequency signals, impeding their... Problem 89PE: The capacitor in Figure 23.55(b) will filler high—frequency signals by shorting them to... Problem 90PE: Unreasonable Results In a recording of voltages due to brain activity (an EEG), a 10.0 mV signal... Problem 91PE: Construct Your Own Problem Consider the use of an inductor in series with a computer operating on 60... Problem 92PE: An RL circuit consists of a 40.0 (resistor and a 3.00 mH inductor. (a) Find its impedance Z at l60.0... Problem 93PE: An RC circuit consists of a 40.0 (resistor and a 5.00 (F capacitor. (a) Find its impedance an 60.0... Problem 94PE: An LC circuit consists of a 3.00 mH inductor and a 5.00 (F capacitor. (a) Find its impedance at... Problem 95PE: What is the resonant frequency of a 0.500 mH inductor connected to a 40.0 (F capacitor? Problem 96PE: To receive AM radio, you want an RLC circuit that can be made to resonate at any frequency between... Problem 97PE: Suppose you have a supply of inductors ranging from 1.00 nH to 10.0 H, and capacitors ranging from... Problem 98PE: What capacitance do you need to produce a resonant frequency of 1.00 GHz, when using an 8.00 nH... Problem 99PE: What inductance do you need to produce a resonant frequency of 60.0 Hz, when using a 2.00 F... Problem 100PE: The lowest frequency in the FM radio band is 88.0 MHz. (a) What inductance is needed to produce this... Problem 101PE: An RLC series circuit has a 2.50 (resistor, a 100 (H inductor, and an 80.0 (F capacitor. (a) Find... Problem 102PE: An RLC series circuit hag a 1.00 k(register, a 150 (H inductor, and a 25.0 nF capacitor. (a) Find... Problem 103PE: An RLC series circuit has a 2.50 (resistor, a 100 (H inductor, and an 80.0 (F capacitor. (a) Find... Problem 104PE: An RLC series circuit has a 1.00 k(resistor, a 1.50 (H inductor, and a 25.0 nF capacitor. (a) Find... Problem 105PE: An RLC series circuit has a 200 (resistor and a 25.0 mH inductor. At 8000 Hz, the phase angle is... Problem 106PE: Referring to Example 23.14, find the average power at 10.0 kHz. Problem 12CQ: Explain how electromagnetic induction can be used to detect metals? This technique is particularly...
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Concept explainers
1. Explain Electromagnetic Induction in two sentences.
2. How can magnet induce current and vice versa?
3. Differentiate Step-up and Step-down transformers
Interaction between an electric field and a magnetic field.
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