College Physics
2nd Edition
ISBN: 9780134601823
Author: ETKINA, Eugenia, Planinšič, G. (gorazd), Van Heuvelen, Alan
Publisher: Pearson,
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Textbook Question
Chapter 21, Problem 14P
* You suggest that eddy currents can stop the motion of a steel disk that vibrates while hanging from a spring Explain how you can do this without touching the disk.
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The north pole of the solenoid shown in the figure is at what point?
a. A
b. B
c. C
d. D
d. Write down three examples of the use of electricity and magnetism in the medical field. For example, an
automated external defibrillator (AED) consists of a capacitor to store electrical energy and electrode pads to
deliver an electrical shock to your heart. As a result, an automated external defibrillator (AED) with CPR
increases the chances of restoring a victim's heartrate after a sudden cardiac arrest. Use three of your own
examples. There are plenty of examples in chapters 43-44.
Example 1:
Example 2:
Example 3:
Use the following constants if necessary. Coulomb constant, k = 8.987 × 10° N · m2 /C2. Vacuum permitivity, eo = 8.854 × 10¬12
Magnetic Permeability of vacuum, µo = 12.566370614356 × 10H/m. Magnitude of the Charge of one electron,
e = -1.60217662 × 10¬19 C. Mass of one electron, m, = 9.10938356 × 10-31 kg. Unless specified otherwise, each symbol carries their usual
meaning. For example, µC means micro coulomb.
F/m.
dz
wire 1
2wire 2
K.- l, -
K.- l2-
A current carrying wire(wire-1) with i = 10 Amperes is placed at the origin on the Y-Z plane. Another current carrying wire(wire-2) with
i2 = 12 Amperes is placed l = 9m distance apart on the Y-axis. The point P2 is lı = 7m from the wire-1. P1 (0, 7,–12), P2 (0,7,0) and the
point P3 (0, 7,8) are on the same line. The direction of the current is given in the figure.
Step 1: Consider a wire-1 only.
Chapter 21 Solutions
College Physics
Ch. 21 - Review Question 21.1 Your friend thinks that...Ch. 21 - Review Question 21.2 You have a bar magnet and a...Ch. 21 - Review Question 21.3 What difficulty would occur...Ch. 21 - Review Question 21.4 Why do we write the law of...Ch. 21 - Review Question 21.5 How does the law of...Ch. 21 - Review Question 21.6 A capacitor in an electric...Ch. 21 - Prob. 7RQCh. 21 - Review Question 21.8 Explain how (a) an electric...Ch. 21 - 1. In which of the experiments with a loop and a...Ch. 21 - If you move the coil in Figure Q21.2 toward the N...
Ch. 21 - The magnetic flux through a 100-cm2 loop is...Ch. 21 - Your friend says that the emf induced in a coil...Ch. 21 - 5. A metal ring lies on a table. The S pole of a...Ch. 21 - 6. One coil is placed on lop of another The bottom...Ch. 21 - Two coils are placed next to each other flat on...Ch. 21 - 8. Two identical bar magnets are dropped...Ch. 21 - A windows metal frame is essentially a metal loop...Ch. 21 - Four identical loops move at the same velocity...Ch. 21 - A 12-V automobile battery provides the thousands...Ch. 21 - A respiration detector consists of a coil placed...Ch. 21 - A parallel plate capacitor and a lightbulb are...Ch. 21 - Prob. 14MCQCh. 21 - A bar magnet falling with the north pole facing...Ch. 21 - 16. An induction cooktop has a smooth surface When...Ch. 21 - Describe three common applications of...Ch. 21 - 18. Two rectangular loops A and B are near each...Ch. 21 - A simple metal detector has a coil with an...Ch. 21 - 20. Construct flux-versus-time and emf-versus-time...Ch. 21 - How is it possible to get a 2000-V emf from a...Ch. 21 - You connect a capacitor and a lightbulb in series...Ch. 21 - Prob. 23CQCh. 21 - * You and your friend are performing experiments...Ch. 21 - You decide to use a metal ring as an indicator of...Ch. 21 - * To check whether a lightbulb permanently...Ch. 21 - * Flashlight without batteries A flashlight that...Ch. 21 - You need to invent a practical application for a...Ch. 21 - * Detect burglars entering windows. Describe how...Ch. 21 - 7. * A coil connected to an ammeter can detect...Ch. 21 - * The B field in a region has a magnitude of 0.40...Ch. 21 - 9. EST How do you position a bicycle tire so that...Ch. 21 - * EST Estimate the magnetic flux through your head...Ch. 21 - 11. * Estimate the magnetic flux through the...Ch. 21 - Prob. 12PCh. 21 - 13. You have the apparatus shown in Figure P21.13....Ch. 21 - * You suggest that eddy currents can stop the...Ch. 21 - * Your friend thinks that an induced magnetic...Ch. 21 - The magnetic flux through three different coils is...Ch. 21 - 17. The magnetic flux through three different...Ch. 21 - 18. A magnetic field passing through two coils of...Ch. 21 - BIO Stimulating the brain in transcranial magnetic...Ch. 21 - * To measure a magnetic field produced by an...Ch. 21 - Prob. 21PCh. 21 - 22 * BIO Breathing monitor An apnea monitor for...Ch. 21 - 23. * A bar magnet induces a current in an -turn...Ch. 21 - * An experimental apparatus has two parallel...Ch. 21 - A Boeing 747 with a 65-m wingspan is cruising...Ch. 21 - Prob. 27PCh. 21 - 28. ** BIO EST Magnetic field and brain cells...Ch. 21 - * You need to test Faraday's law You have a...Ch. 21 - 30. * You build a coil of radius r (m) and place...Ch. 21 - * EST Generator for space station Astronauts on a...Ch. 21 - 35. * A toy electric generator has a 20-tum...Ch. 21 - 36. * A generator has a 450-turn coil that is 10...Ch. 21 - 39. * A generator has a 100-turn coil that rotates...Ch. 21 - Prob. 40PCh. 21 - * A rectangular wire loop is moving with constant...Ch. 21 - field that points into the page (Figure P21.42)....Ch. 21 - 43. The voltage across an AC power supply is given...Ch. 21 - 44. * The alternating current through a capacitor...Ch. 21 - * The alternating current through a solenoid is...Ch. 21 - 46. * The rms voltage of household AC in Europe is...Ch. 21 - Prob. 47PCh. 21 - Prob. 48PCh. 21 - 49. You need to build a transformer that can step...Ch. 21 - 50. Your home’s electric doorbell operates on 10...Ch. 21 - 51. A 9.0-V battery and switch are connected in...Ch. 21 - * You are fixing a transformer for a toy truck...Ch. 21 - 53. * A wire loop has a radius of 10 cm. A...Ch. 21 - BIO Hammerhead shark A hammerhead shark (Figure...Ch. 21 - ** You have a 12-V battery, some wire, a switch,...Ch. 21 - 61.* EST A sparker used to ignite lighter fluid in...Ch. 21 - * EST Design a magnetometer Your friend needs to...Ch. 21 - Prob. 63GPCh. 21 - 64 EST MRI Jose needs an MRI (magnetic resonance...Ch. 21 - * Magstripe reader A magstripe reader used to read...Ch. 21 - 66. Show that when a metal rod L meters long moves...Ch. 21 - 67. ** EST The Tower of Terror ride Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...Ch. 21 - BIO Magnetic induction tomography (MIT) Magnetic...
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- (a) A physicist performing a sensitive measurement wants to limit the magnetic force on a moving charge in her equipment to less than 1.001012N. What is the greatest the charge can be if it moves at a maximum speed of 30.0 m/s in the Earth’s field? (b) Discuss whether it would be difficult to limit the charge to less than the value found in (a) by competing it with typical static electricity and noting that static is often absent.arrow_forwardVerify Equations rn=n2ZaB and aB=h242mekqe2=0.5291010 m using the approach stated in the text. That is, equate the Coulomb and centripetal forces and then insert an expression for velocity from the condition for angular momentum quantization.arrow_forward(a) What is the force per meter on a lightning bolt at the equator that carries 20,000 A perpendicular to the Earth's 3.00105-T field? (b) What is the direction of the force it the current is straight up and the Earth’s field direction is due north, parallel to the ground?arrow_forward
- Review. Alter removing one string while restringing his acoustic guitar, a student is distracted by a video game. His experimentalist roommate notices his inattention and attaches one end of the string, of linear density = 3.00 10-3 kg/m. to a rigid support. The other end passes over a pulley, a distance = 64.0 cm from the fixed end, and an object of mass m = 27.2 kg is attached to the hanging end of the string. The roommate places a magnet across the string as shown in Figure P31.35. The magnet does not touch the string, but produces a uniform field of 4.50 mT over a 2.00-cm length of the string and negligible field elsewhere. Strumming the string sets it vibrating vertically at its fundamental (lowest) frequency. The section of the string in the magnetic field moves perpendicular to the field with a uniform amplitude of 1.50 cm. Find (a) the frequency and (b) the amplitude of the emf induced between the ends of the string.arrow_forwardIntegrated Concepts The Tethered Satellite in Figure 23.12 has a mass at 525 kg and is at the end of a 20.0 km long, 2.50 mm diameter cable with the tensile strength of steel. (a) How much does the cable stretch if a 100 N force is exerted to pull the satellite in? (Assume the satellite and shuttle are at the same altitude above the Earth.) (b) What is the effective force constant of the cable? (c) How much energy is stored in it when Stretched by the 100 N force?arrow_forwardThree long, current-carrying wires are parallel to one another and separated by a distance d. The magnitudes and directions of the currents are shown in Figure P30.91. Wires 1 and 3 are fixed, but wire 2 is free to move. Wire 2 is displaced to the right by a small distance x. Determine the net force (per unit length) acting on wire 2 and the angular frequency of the resulting oscillation. Assume the mass per unit length of wire 2 is and x d. FIGURE P30.91arrow_forward
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