Phys 0175 - Lecture 33

Phys 0175 - Lecture 33 - Lecture 33 (Apr. 8, 2009):...

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Lecture 33 (Apr. 8, 2009): Magnetic materials (conclusion of Ch. 32) Electromagnetic waves (Chapter 33): The electromagnetic spectrum Description of traveling em waves
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Magnetic Materials: As we have just seen, each electron in an atom has a spin magnetic dipole moment and an orbital magnetic dipole moment which combine vectorially. The vector sum of these two magnetic dipole moments combines vectorially with the magnetic dipole moments of all of the other electrons in the atoms that make up a sample of material. If the combination of all of these magnetic dipole moments produces a magnetic field, the material is magnetic. There are three types of magnetism: Diamagnetism Paramagnetism Ferromagnetism
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Diamagnetism: very weak magnetic dipole moments are produced in the atoms of the material when it is placed in an external magnetic field. The dipole moments and hence their net field disappear when the external magnetic field is removed. Examples: uranium, platinum, aluminum, sodium. Paramagnetism:
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Phys 0175 - Lecture 33 - Lecture 33 (Apr. 8, 2009):...

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