ENGRI111_HW5solutions_2006 - ENGRI 111 Homework#5 Due...

Info icon This preview shows pages 1–2. Sign up to view the full content.

ENGRI 111 Homework #5 Due Monday, Nov. 6, 2006 1. Write concise answers for the following questions regarding magnetic moments: a. What are the two sources of magnetic moments for electrons? Why? Electrons have two sources of magnetic moments. Recall that a moving electrical charge generates a magnetic field. As the negatively charged electron orbits around the nucleus, it generates a magnetic field (and an associated magnetic moment). This orbital moment can be viewed as a component of the overall atomic magnetic moment. The second, and more important, source of electron magnetic moment is the spin of the electron. Recall that an electron can have either a spin-up or spin-down configuration. This can be interpreted as an up or down magnetic moment, respectively. b. Do all electrons have a net magnetic moment? Why or why not? All electrons have a net magnetic moment. An electron can only take a spin-up or a spin-down configuration; there cannot be some combination that would produce a spin-zero electron. c. Do all atoms have a net magnetic moment? Why or why not? All atoms do not necessarily have a net magnetic moment. The magnetic moment caused by one orbiting electron can be effectively canceled by the magnetic moment generated by another electron orbiting in the opposite direction. A collection of spin-up and spin-down electrons can negate each other’s magnetic moment and result in an overall zero spin. 2. Briefly explain why ferromagnetic and ferroelectric behavior ceases above the Curie temperature. Ferromagnetic behavior depends on the ability of a material’s magnetic domains to remain aligned in a preferred direction in the absence of an applied magnetic field. As you increase the temperature of a material, you provide its atoms with more thermal energy.
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Image of page 2
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '07
  • Magnetism, Magnetic Field, Fundamental physics concepts, Magnetic moment

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern