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Discussion in 'General Electronics Discussion' started by bhuvanesh, Jun 19, 2014.

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  1. Jun 19, 2014 #1
    bhuvanesh

    bhuvanesh

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    while watching video i have seen this statement "oscillating electric field oscillating magnetic field not electromagnetic wave"i dont understand what he really mean.thank you
     
  2. Jun 19, 2014 #2
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Without context, I doubt anyone else does either.
     
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  3. Jun 19, 2014 #3
    bhuvanesh

    bhuvanesh

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    sorry

    while watching video i have seen this statement "oscillating electric field create oscillating magnetic field, not electromagnetic wave"i dont understand what he really mean.thank you
     
  4. Jun 19, 2014 #4
    davenn

    davenn Moderator

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    my bold added for clarity
    Yes that is correct ... but it goes further
    an oscillating electric field creates an oscillating magnetic field, which creates an oscillating electric field
    over and over ... result ... a electromagnetic field

    BUT NOTE it can start the other way as well
    an oscillating magnetic field creates an oscillating electric field which creates an oscillating magnetic field... etc etc

    result = still an electromagnetic field

    ( as far as I'm aware ) One cannot exist without the other


    Dave
     
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  5. Jun 19, 2014 #5
    (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    "not an electromagnetic wave" is an interesting statement, because in that case he must mean you're creating low energy photons.
     
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  6. Jun 19, 2014 #6
    Arouse1973

    Arouse1973 Adam

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    Unfortunately you don't have a choice in free air whether an EM wave is generated or not when you have a changing magnetic and electric field. They go hand in hand as Dave said. It depend on where you interact with these fields which matters.

    The EM wave is generated in the transition region between near field and far field, you don't have a choice about that. Electric fields and magnetic can exist in there own right in the reactive field and have different phases and magnitudes but they will always appear together if they are going to create an EM wave. Unlike triobo-electric charging which can have an electric field without a magnetic field but this is a static field.

    Adam
     
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