is this current flowing

Discussion in 'Physics' started by ndshelp, Oct 6, 2011.

  1. ndshelp

    Thread Starter New Member

    Oct 6, 2011
    5
    0
    My son in the 9th grade asked a question I can't seem to answer. He was
    taught that current is a measure of charge in motion-so far so good, but
    if you take a piece of glass and build up a charge by rubbing it and then
    throw it are you not getting charge and motion ? I am in the electronics field
    and told him no, but the more I think about the more I am not sure.
     
  2. steveb

    Senior Member

    Jul 3, 2008
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    469
    Technically, that is a form of current. You could also say that if you walk past a stationary charged piece of glass, there is current relative to the reference frame that moves with you.
     
  3. someonesdad

    Senior Member

    Jul 7, 2009
    1,585
    141
    The answer is "yes". It's analogous to the current in, say, an ion or electron beam. But, in this case, there just happens to be an inert uncharged chunk of matter moving along with the beam.

    You can define current as the movement of charge through a cross sectional area (whether it takes place in a chunk of matter like a conductor or not). This is analogous to the definition of flow of a fluid.

    Your son probably owes you a wedgie. :p
     
  4. logearav

    Member

    Aug 19, 2011
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    0
    The answer is "yes". It's analogous to the current in, say, an ion or electron beam.
    Sir,
    What do you mean by "inert uncharged chunk of matter"?
     
  5. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,387
    1,605
    Not only is it a current but it is also generating an electromagnetic wave.

    Danger Will Robinson! Radiation!
     
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