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. format_list_bulleted
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