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I’m going through a couple of T/F statements in class.

One I’m stumped with,

“If a point in the magnetic field is neutral, it’s magnetic field vector components are all 0”

At first sight it looks true - because the point is neutral. But I don’t know if I’m missing something?

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  • $\begingroup$ I have no idea what it means for "a point in the magnetic field" to be "neutral." Do you have a resource which uses this language, or is this just something your instructor has said? $\endgroup$
    – J. Murray
    Commented May 27, 2021 at 2:42
  • $\begingroup$ I’m certain it means a point in space where the magnetic field is zero - don’t know if that’s the correct term. $\endgroup$ Commented May 27, 2021 at 2:45
  • $\begingroup$ Well, in that case it seems to be a relatively straightforward question, do you have any specific conceptual issue with it? $\endgroup$
    – J. Murray
    Commented May 27, 2021 at 2:50
  • $\begingroup$ A number of mentions of neutral point on this website including Position of neutral points. A neutral point is a position at which the magnetic field is zero. $\endgroup$
    – Farcher
    Commented May 27, 2021 at 6:33
  • $\begingroup$ @Farcher Oh, interesting. When I was doing neutron polarimetry, where a nonzero magnetic field is required for adiabatic spin transport, we referred to such points as “zeros in the magnetic field” or “field zeros.” $\endgroup$
    – rob
    Commented May 28, 2021 at 2:18

1 Answer 1

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This sounds like a vocabulary issue: we use “neutral” to refer to the absence of electric charge, which is mostly independent of the presence or absence of a magnetic field. You can have a zero magnetic field or a nonzero magnetic field at the location of a particle whose electric charge is positive, negative, or zero.

The construction “a point is neutral” is not one I’ve encountered before; it doesn’t quite scan correctly for me. It could be the author meant something different. Tread carefully.

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