Homework 5 - Jacob Sutker ENGRI 111 Homework#5 Due Monday...

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Jacob Sutker November 5, 2006 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? 1) The orbital motion of the electron around the nucleus 2) The spin of the electron is its second source for a dipole magnetic moment Why? There are two different sources of magnetic moments on electrons because electrons not only nucleus but also spin on their own axis. b. Do all electrons have a net magnetic moment? Why or why not? Yes. Each individual electron has a net magnetic moment. Each single electron’s magnetic moment is formed due to its orbit around the nucleus of the atom and the contribution of the electrons spin. c. Do all atoms have a net magnetic moment? Why or why not? No, because many atoms have magnetic moments that cancel each other out. If two magnetic moments of the same magnitude point in opposite directions, the net magnetic moment is 0, and therefore the atom does not have a net magnetic moment. This is the case for many atoms. If an atom has a completely filled outer electron shell there will be no dipole moment because of cancellation. 2. Briefly explain why ferromagnetic and ferroelectric behavior ceases above the Curie temperature. Ferromagnetic and ferroelectric behavior ceases above the Curie temperature because the unit cells change form under such a temperature causing the units to have no net dipole moment. At these temperatures the ferromagnetic properties are lost.
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