Conceptual Physics (12th Edition)
12th Edition
ISBN: 9780321909107
Author: Paul G. Hewitt
Publisher: PEARSON
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Textbook Question
Chapter 24, Problem 17RCQ
Why are the magnetic fields of superconducting magnets often stronger than those of conventional magnets?
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at a microscopic level, something similar to a circular electrical current is occurring. Using what you know about atoms, suggest a reason there may be something like "circular current" at a microscopic level in a bar magnet.
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A superconducting metal can allow an external magnetic field to penetrate the surface over a given distance.
Imagine, the north pole of the magnet is the positive side. try and PREDICT, how the negative electrons in the metal would react to the electric force of the positive pole of the magnet?
Chapter 24 Solutions
Conceptual Physics (12th Edition)
Ch. 24 - Prob. 1RCQCh. 24 - Prob. 2RCQCh. 24 - Prob. 3RCQCh. 24 - Prob. 4RCQCh. 24 - Prob. 5RCQCh. 24 - How does magnetic field strength relate to the...Ch. 24 - Prob. 7RCQCh. 24 - Prob. 8RCQCh. 24 - Prob. 9RCQCh. 24 - Prob. 10RCQ
Ch. 24 - Prob. 11RCQCh. 24 - Prob. 12RCQCh. 24 - Prob. 13RCQCh. 24 - Prob. 14RCQCh. 24 - Prob. 15RCQCh. 24 - Prob. 16RCQCh. 24 - Why are the magnetic fields of superconducting...Ch. 24 - Prob. 18RCQCh. 24 - Prob. 19RCQCh. 24 - Prob. 20RCQCh. 24 - What relative direction between a magnetic field...Ch. 24 - Prob. 22RCQCh. 24 - Prob. 23RCQCh. 24 - Prob. 24RCQCh. 24 - Prob. 25RCQCh. 24 - Prob. 26RCQCh. 24 - Prob. 27RCQCh. 24 - Prob. 28RCQCh. 24 - Prob. 29RCQCh. 24 - Prob. 30RCQCh. 24 - Prob. 31RCQCh. 24 - Prob. 32RCQCh. 24 - Prob. 33RCQCh. 24 - Prob. 34RCQCh. 24 - Prob. 35RCQCh. 24 - 36. To make compass, point an ordinary iron nail...Ch. 24 - If you place a chunk of iron near the north pole...Ch. 24 - Prob. 38RCQCh. 24 - Prob. 39RCQCh. 24 - 40. What kind of force field surrounds a...Ch. 24 - Prob. 41RCQCh. 24 - 42. A friend tells you that a refrigerator door,...Ch. 24 - Prob. 43RCQCh. 24 - Prob. 44RCQCh. 24 - Prob. 45RCQCh. 24 - 46. One way to compass is to stick magnetized...Ch. 24 - Prob. 47RCQCh. 24 - 48. The north pole of a compass is attracted to...Ch. 24 - Prob. 49RCQCh. 24 - 50. In what position can a current-carrying loop...Ch. 24 - Prob. 51RCQCh. 24 - 52. In Figure 24.15 we see a magnet exerting a...Ch. 24 - Prob. 53RCQCh. 24 - A straight current-carrying wire is horizontal and...Ch. 24 - Prob. 55RCQCh. 24 - Prob. 56RCQCh. 24 - Prob. 57RCQCh. 24 - A beam of electrons passes through a magnetic...Ch. 24 - Prob. 59RCQCh. 24 - 60. A proton moves in a circular path...Ch. 24 - Prob. 61RCQCh. 24 - Prob. 62RCQCh. 24 - Prob. 63RCQCh. 24 - 64. Residents of northern Canada are bombarded by...Ch. 24 - Prob. 65RCQCh. 24 - Prob. 66RCQCh. 24 - Prob. 67RCQCh. 24 - One way to shield a habitat in outer space from...Ch. 24 - Prob. 69RCQCh. 24 - Prob. 70RCQCh. 24 - Prob. 71RCQCh. 24 - 72. What is the magnetic effect of placing two...Ch. 24 - Prob. 73RCQCh. 24 - Prob. 74RCQCh. 24 - Prob. 75RCQCh. 24 - Prob. 76RCQCh. 24 - Prob. 77RCQCh. 24 - Prob. 78RCQCh. 24 - 79. A cyclotron is a device for accelerating...Ch. 24 - 80.A magnet can exert a force on a moving charged...Ch. 24 - Prob. 81RCQCh. 24 - 82. When a current is passed through a helically...
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- Review. A fundamental property of a type 1 superconducting material is perfect diamagnetism, or demonstration of the Meissner effect, illustrated in Figure 29.27 in Section 29.6 and described as follows. If a sample of superconducting material is placed into an externally produced magnetic field or is cooled to become superconducting while it is in a magnetic field, electric currents appear on the surface of the sample. The currents have precisely the strength and orientation required to make the total magnetic field be zero throughout the interior of the sample. This problem will help you understand the magnetic force that can then act on the sample. Compare this problem with Problem 39 in Chapter 25, pertaining to the force attracting a perfect dielectric into a strong electric field. A vertical solenoid with a length of 120 cm and a diameter of 2.50 cm consists of 1 400 turns of copper wire carrying a counterclockwise current (when viewed from above) of 2.00 A as shown in Figure P31.48a. (a) Find the magnetic field in the vacuum inside the solenoid. (b) Find the energy density of the magnetic field. Now a superconducting bar 2.20 cm in diameter is inserted partway into the solenoid. Its upper end is far outside the solenoid, where the magnetic field is negligible. The lower end of the bar is deep inside the solenoid. (c) Explain how you identify the direction required for the current on the curved surface of the bar so that the total magnetic field is zero within the bar. The field created by the supercurrents is sketched in Figure P31.48b, and the total field is sketched in Figure P31.48c. (d) The field of the solenoid exerts a force on the current in the superconductor. Explain how you determine the direction of the force on the bar. (e) Noting that the units J/m3 of energy density are the as the units N/m2 of pressure, calculate the magnitude of the force by multiplying the energy density of the solenoid field times the area of the bottom end of the superconducting bar. Figure P31.48arrow_forwardThe density of charge carriers far copper is 8.471028 electrons per cubic meter. What will be the Hall voltage reading from a probe made up of 3cm2cm1cm ( (LWT) ) copper plate when a current of 1.5 A is passed through it in a magnetic field of 2.5 T perpendicular to the 3cm2cm .arrow_forwardThe Hall effect is to be used to find the density of charge carriers in an unknown material. A Hall voltage 40 V for 3-A current is observed in a 3-T magnetic field far a rectangular sample with length 2 cm, width 1.5 cm, and height 0.4 cm, Determine the density of the charge carriers.arrow_forward
- In a right-handed coordinate system, if a negatively-charged particle moves in the +y direction through a magnetic field pointing in the +z direction, what is the direction of the magnetic force acting on the molecule?arrow_forwardAssume you have a spherical magnetic particle that is 4-nm in diameter with a uniaxial anisotropy Ku=5x10³ J/m³, a magnetization of 1x106 A/m and assuming an attempt time is to = 10-1⁰ sec.:arrow_forward1What is magnetic flux? the work done by a magnetic field on a charged particle the velocity of the charged particle moving through a magnetic field the number of magnetic field lines passing through a specific area the change in magnetic field over time 2A current is induced as it moves through a magnetic field. What would happen to the current if it were to be moved through a stronger magnetic field? the induced current will stay constant the induced current will decrease the induced current will increase there is not enough information to say 3Which of the following would be considered electromagnetic induction? Select all that apply. moving a conducting wire through a magnetic field moving an electric charge in a magnetic field moving a magnetic field over a charged particle moving a magnet in an electric field Which of the following are true? Select…arrow_forward
- If an electron in a particular atom has an orbital magnetic quantum number of 1 , how much energy is associated with the orientation of its magnetic dipole moment in an external field of 0.945 T? For comparison, note that the energy differences between electrons in most atoms are typically on the order of an electron-voltarrow_forwardA bar magnet has length 3 cm, cross- sectional area 2 cm? and magnetic moment 3 Am?. The intensity of magnetization of bar magnet is (Chap-15) A) 2x 10$ A/m C) 4x 105 A/m. D) 5x 105 A/m B) 3 x 105 A/marrow_forwardMagnetic resonance imaging (MRI) makes it possible to see details of soft tissue that aren’t visible in x-ray images. Yet soft tissue isn’t a magnetic material (it’s not attracted to a magnet). How does MRI work?arrow_forward
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