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B Magnetic field when relative velocity is zero

  1. Jan 14, 2017 #1
    A current carrying conductor produces a magnetic field but what if there is an object which has the same speed as current. Will there be magnetic field by the current carrying conductor for that object?
     
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  3. Jan 14, 2017 #2

    Orodruin

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    A current is generally not associated with a speed.

    The magnetic field mixes with the electric field under Lorentz transformations. This means (among other things) that observers in relative motion will measure different magnetic fields.
     
  4. Jan 14, 2017 #3

    nrqed

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    When asking that question, you have to specify in what frame you are measuring the magnetic field. I assume you are asking what the magnetic field is in the frame of the object . Then no, there is no magnetic field in that frame (but the electric field in that frame is different from the electric field in other frames).
     
  5. Jan 14, 2017 #4

    jtbell

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    I suppose he is referring to the drift speed of the electrons in the conductor.
     
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