Connect with us

radio waves

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

Scroll to continue with content
  1. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    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. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    Without context, I doubt anyone else does either.
     
    bhuvanesh likes this.
  3. bhuvanesh

    bhuvanesh

    201
    0
    Aug 29, 2013
    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. davenn

    davenn Moderator

    13,710
    1,911
    Sep 5, 2009
    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
     
    bhuvanesh likes this.
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,448
    2,809
    Jan 21, 2010
    "not an electromagnetic wave" is an interesting statement, because in that case he must mean you're creating low energy photons.
     
    bhuvanesh likes this.
  6. Arouse1973

    Arouse1973 Adam

    5,165
    1,087
    Dec 18, 2013
    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
     
    bhuvanesh likes this.
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-