Superposition of magnetic fields

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Discussion Overview

The discussion revolves around the application of the superposition principle to magnetic fields, particularly in the context of magnetically coupled loop antennas and the interactions of magnetic fields generated by these antennas.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant inquires about the applicability of the superposition principle for magnetic fields.
  • Another participant confirms that the superposition principle can be used and asks if there is a specific problem related to it.
  • A participant describes a scenario involving a transmitter antenna, a receiving antenna, and a coupling coil, highlighting the complexity due to closely spaced components and the interaction of multiple magnetic fields.
  • One participant notes that while superposition may work in free space, it may not apply within a medium, suggesting a limitation to the principle's applicability.

Areas of Agreement / Disagreement

Participants express differing views on the applicability of the superposition principle, with one asserting its validity in free space and another cautioning against its use in a medium, indicating that the discussion remains unresolved.

Contextual Notes

The discussion does not clarify the specific conditions under which superposition may fail in a medium, nor does it resolve the complexities introduced by the interactions of the magnetic fields in the described setup.

temujin
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Hi

a short question: can I use the superposition principle for magnetic fields?


reegards
tem
 
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Of course you can. Do you have a specific problem in mind?
 
yes, I do...
(hard to explain without circuit diagrams but)

I am working with magnetically coupled loop antennas. In my tests I have one transmitter antenna+a receiving antenna. Then a coupling coil consisting of 2 coil connected with a wire, so that one of the coils interfaces with the rx the other with the tx.)

Tx antenna generates an alternating magnetic field, current is induced in the1st coupling coil, magnetic field is created in the 2nd coupling coil and finally a voltage is induced in the rx coil. :-)

Problem is that rx antenna+the 2 coils in the coupling coils are closely spaced, so that all the magnetic fields interact.

I need to visualize the magnetic field lines at the rx position, but I am not sure how to do it since there are incident magnetic fields and induced ones.

t.
 
Superposition will work in free space, but not necessarily inside a medium.

Claude.
 

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