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Why flow of electrons through a conductor produce magnetic field

  1. Jul 5, 2015 #1
    i want to know why flow of electron produces magnetic feild
    sombody says this is because of spin of electron or because of flow of charge or reletivity of flowing electron.
    any body please clear my confusion?????
     
  2. jcsd
  3. Jul 5, 2015 #2

    atyy

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    It has nothing to do with the spin of the electron. You can take it in two ways. Both are accepted because they fit in a mathematically consistent theory that describes what we observe.

    1) It is a fundamental postulate (Ampere's law, one of Maxwell's equations) that the flow of charge produces a magnetic field. https://en.wikipedia.org/wiki/Ampère's_circuital_law

    2) Ampere's law can be understood as a requirement for consistency between electrostatics and special relativity. A very good explanation of this point of view is found in Purcell's and Ohanian's textbooks, as well as Daniel Schroeder's http://physics.weber.edu/schroeder/mrr/MRRtalk.html.

    Edit: Although the electron spin is not responsible for Ampere's law, there is a magnetic field associated with the electron spin, which can be seen in phenomena such as electron spin resonance: https://project-physicsteaching.web...h/experiments/electron-spin-resonance-qrg.pdf (I didn't read it carefully, but it seems like a non-crackpot link although it adheres to some theory called quantom physics!)
     
    Last edited: Jul 5, 2015
  4. Jul 6, 2015 #3

    bhobba

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  5. Jul 6, 2015 #4

    jtbell

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    Who says this?
     
  6. Jul 7, 2015 #5
    spin effect the magnetic feild produced due flow of electron.
    i my textbook this thing is written.
    thats why i am confused.
    why there is relation between relativity and magnetic feild produce due to flow of electron
     
  7. Jul 7, 2015 #6

    Lok

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    A movie is like a 1000 words*fps*time.
     
  8. Jul 7, 2015 #7

    bhobba

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    That not true. Your textbook is unlikely to have said that because its false. If it did you can tell your teacher it needs to be corrected.

    Spin is a quantum effect but heuristically its viewed like a spinning point charge which from Maxwell's equations has a magnetic field. That the electrons spin has nothing to do with their flow through a conductor which also produces a magnetic field.

    Thanks
    Bill
     
  9. Jul 7, 2015 #8

    jtbell

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    Is the book written in English? If it is, can you give us an exact quotation from it?
     
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