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Electrostatic field

Discussion in 'Electronic Design' started by [email protected], Dec 26, 2006.

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  1. Guest

    Hi,
    As you know there is an electrical field around each electrostatic
    charge. I know how to create an electrostatic field. But I have problem
    by creating a "variable electrostatic field". Can you give me a guide?

    Thanks in Advance
     
  2. Vary the voltage of what's generating the field

    Dirk
     
  3. Guy Macon

    Guy Macon Guest

    Use AC (alternating current) if you want a varying electmagnetic field.

    Use DC (direct current) if don't want it to vary.
     
  4. Tom Bruhns

    Tom Bruhns Guest

    "Variable" and "static" are mutually exclusive, or a bit more
    accurately, "varying" and "static" are mutually exclusive. You can
    change an electrostatic field by changing the distribution of charges
    which creates the field, and also by changing the dielectric (e.g., by
    replacing some portion of the dielectric with a dielectric with a
    different permittivity) which contains the field, but when the field is
    changing, it is no longer static.

    Consider, if you will, two flat metal plates, parellel to one another,
    and separated by a short distance, with air (or a vacuum) between the
    plates. Remove charge from one plate and put it on the other. You now
    have a charged capacitor, with an electrostatic field which is most
    intense, and reasonably uniform, between the plates. Now pull the
    plates further apart, or allow them to come closer together. By moving
    the charged plates, you will change the field between the plates (and
    the field in the surrounding area). The charges will also redistribute
    themselves on the plates at the same time. But the motion of the
    plates and the charges on the plates represent currents, which create
    magnetic fields, so during the time that the charges are moving, the
    fields are not only electric, but magnetic as well.

    Cheers,
    Tom
     
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