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electric field in a circuit

Discussion in 'Electronic Design' started by ERICA, Apr 11, 2004.

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  1. ERICA

    ERICA Guest

    why electric field is zero in non-resistive part but non-zero in resistive part?
    and why whenever a p.d is applied, there is an electric field?
     
  2. It is because students in HK do not do their homework due to playing on the
    net instead.
     
  3. Fred Bloggs

    Fred Bloggs Guest

    Electric field results from sources of charge density resulting from an
    input energy required to establish the source separation in space- hence
    the "p.d.". There can be no field gradient in a "non-resistive part"- by
    which I understand you to mean perfect conductor- because ****by
    definition of a perfect conductor*** there can be no such charge
    gradient- J=sigma*E and sigma=oo. Your questions are elementary and
    inappropriate to this forum. Take it to sci.physics.
     
  4. Roger_Nickel

    Roger_Nickel Guest

    Because we define it to be so. If you want to use some other model, go
    ahead.
     
  5. ERICA

    ERICA Guest

    I am sorry to bring so much inconvenience to you .Thanks a lot for
    your answer and advice. I will exam m question carefully berore
    posting tnem next time.
     
  6. Don't worry about the newsgroup grumps ... these are good questions but
    maybe there is a more educational oriented newsgroup ... think about the
    current flowing through a perfect wire (i.e. zero resistance) ... there is
    no voltage drop. Technically there would be a field according to right hand
    rule encircling the wire ... with a resistive component you will be
    resisting the flow which removes energy from the system in the form of heat.
    You need to get a good book on electronics and look at the math equations
    for RC and LRC circuits. Have you ever built an electromagnet? That will
    be the best intuitive explanation of this physics effect ... take a heavy
    iron nail and wrap it tightly with copper wire. Attach both ends of the
    wire to a battery and you can lift at least paper clips.

    Ed
     
  7. ERICA

    ERICA Guest

    thank you very much for your useful comment. i have tried to build an
    electromagnet and now i know the answer. in fact, i have never
    throught of using magnetism to explain the question in circuit...
    again, thanks a lot, next time i will try to relate different topics
    up to explain questions. i think i will enjoy reading electronics
    books.
     
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