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32 Magnetism of Matter:Maxwell ’ s Equations

32 Magnetism of Matter:Maxwell ’ s Equations. 32-1 Magnets. The simplest magnetic structure that can exit is a magnetic dipole.Magnetic monopoles do not exist(as far as we know). 32-2 Gauss ’ Law for Magnetic Fields. 32-3 The Magnetism of Earth. 32-4 Magnetism and Electrons.

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32 Magnetism of Matter:Maxwell ’ s Equations

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  1. 32 Magnetism of Matter:Maxwell’s Equations 32-1 Magnets The simplest magnetic structure that can exit is a magnetic dipole.Magnetic monopoles do not exist(as far as we know)

  2. 32-2 Gauss’ Law for Magnetic Fields

  3. 32-3 The Magnetism of Earth

  4. 32-4 Magnetism and Electrons Spin Magnetic Dipole Moment

  5. Orbital Magnetic Dipole Moment

  6. Loop Model for Electron Orbits

  7. Loop Model in a Nonuniform Field

  8. 32-5 Magnetic Materials Diamagnetism Paramagnetism Ferromagnetism

  9. 32-6 Diamagnetism A diamagnetic material placed in an external magnetic field develops a magnetic dipole moment directed opposite .If the field is nonuniform,the diamagnetic material is repelled from a region of greater magnetic field toward a region of lesser field.

  10. 32-7 Paramagnetism A paramagnetic material placed in an external magnetic field develops a magnetic dipole moment in the direction of .If the field is nonuniform,the paramagnetic material is attracted toward a region of greater magnetic field from a region of lesser field.

  11. Sample Problem 32-1

  12. 32-8 Ferromagnetism

  13. Magnetic Domains A ferromagnetic material placed in an external magnetic field develops a strong magnetic dipole moment in the direction of If the field is nonuniform,the ferromagnetic material is attracted toward a region of greater magnetic field from a region of lesser field.

  14. Sample Problem 32-2 needle’s mass Step one: N= iron’s atomic mass iron’s Atomic= mass iron’s molar mass M Step two: Acogadro’s number NA

  15. mNA Step three: N= M needle’s mass m Step four: =(needle’s density)(needle’s volume) =(7900kg/m3)(1.5×10－8m3) =1.185×10-4kg Step five:

  16. Step six:

  17. Hysteresis

  18. 32-9 Induced Magnetic Fields

  19. Ampere-Maxwell Law

  20. Sample Problem 32-3 (a) Step one: Step two:

  21. Step three: Step four:

  22. (b) (c)

  23. 32-10 Displacement Current

  24. Finding the Induced Magnetic Field

  25. Sample Problem 32-4 (a) Step one: Step two:

  26. Step three: Step four:

  27. (b) Step one: Step two:

  28. 32-11 Maxwell’s Equations Gauss’ law for electricity Gauss’ law for magnetism

  29. Faraday’s law Ampere-Maxwell law 主菜单

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