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External electro-magneteic field acting on a wire

  1. May 9, 2014 #1
    Hello, I am interested in knowing what happens ta wire trough which current is flowing, when an external magnetic, electrical or both , field is applied? Does the voltage or current change, can it be changed this way? Can you also provide some equations of this phenomenon, and also mix-induction, for example what happens to a wire which has an solenoid wrapped around it(leaving space between them), and if current flows trough the both of them or only one of them , what happens? This is only my personal interest in the topic, thank you in advance.
     
  2. jcsd
  3. May 10, 2014 #2

    UltrafastPED

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    Since the wire is electrically neutral, but generates its own magnetic field ... what do you think?
     
  4. May 10, 2014 #3
    I understand that with a varying magnetic field we can induce current in the wire, which will either oppose or lead the existing current, but is possible to change the voltage?
     
  5. May 10, 2014 #4

    UltrafastPED

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    Induction refers to an "electromotive force", or EMF. Yes, this is a change in the applied voltage.
     
  6. May 10, 2014 #5
    So to , for example, increase the voltage, do I need an electrical field or magnetic field, or combination of both?
     
  7. May 10, 2014 #6

    UltrafastPED

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    If there is an electric field, the wire will feel it - the field is the gradient of the voltage.

    For a magnetic field to generate an EMF it must be in motion wrt the wire ... just like any generator.
     
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