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Cancel displacement current?

Discussion in 'Electronic Design' started by Robert kenworth, Nov 30, 2006.

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  1. Is it possible to cancel or diminish the displacement current between
    two charged plates of a flat capacitor by applying an external
    magnetic field in opposition to the intenal B field of the capacitor?

    Robert K.
     
  2. Guest

    The expression for the displacement current, \partial D\over\partial t
    shows that it is proportional to the time derivative of the voltage
    across the capacitor's plates. That means that to eliminate the
    dispacement current the voltage must stay constant. Of course, one can
    apply the external magnetic field to counteract any change in emf
    across the plates but I do not think that this is what you are after.

    The proportionality constant (electric permittivity) is extremely
    small, so such `currents' are usually on the order of nA. It really is
    just a mathematical `fudge factor' more than a real current (which is
    also a very poor name for it) so why would you want to eliminate it? It
    has nothing to do with leakage across the capacitor.

    Alex
     
  3. jasen

    jasen Guest

    not in general, and certainly not in the ideal case,
     
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