Can Magnetic Fields Be Projected into Non-Conductive Materials?

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SUMMARY

This discussion centers on the projection of magnetic fields and the induction of magnetic properties in non-conductive materials. It establishes that magnetization, the process of inducing secondary magnetic fields, occurs through the alignment of microscopic current loops within ferromagnetic materials. The conversation references the 184" cyclotron at UC Berkeley, which produced a stray magnetic field of up to 60 Gauss extending approximately 50 feet, demonstrating the practical implications of magnetic field projection. The discussion concludes that while magnetic fields can influence nearby materials, the ability to induce magnetization in non-conductive substances remains a complex challenge.

PREREQUISITES
  • Understanding of magnetization and magnetic fields
  • Familiarity with ferromagnetic materials and their properties
  • Knowledge of electromagnetic theory
  • Basic principles of cyclotron operation and magnetic field generation
NEXT STEPS
  • Research the principles of magnetization in ferromagnetic materials
  • Explore the design and function of cyclotrons, focusing on magnetic field generation
  • Investigate methods for inducing magnetic properties in non-conductive materials
  • Learn about Helmholtz coils and their applications in creating uniform magnetic fields
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Physicists, electrical engineers, materials scientists, and anyone interested in the applications of magnetic fields in technology and research.

ewalexander
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So I have had a question running through my head for a while now.

Can a magnetic field be projected?

I guess that is very general so to elaborate what I am asking is that could you make a device that can cause an item outside of itself to have a magnetic field? Also is there any way to induce a magnetic field in a non conductive material?
 
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Conductivity is not the same as magnetization. The ability to induce secondary magnetic fields in an object is called magnetization. A classical explanation of this phenomenon is that microscopic current loops are aligned with the applied magnetic field. The macroscopic result of all these aligned current loops is a macroscopic effective current loop that creates its own magnetic field. In a ferromagnetic material, the alignment of these loops, or domains, can be retained after the applied magnetic field is gone. So you can create a permenant or at least temporary magnet by applying a strong magnetic field to a suitable material. Indeed, this is how many permanent magnets are created, in addition to other steps like heating to a high temperature.

So I do not quite understand what you are asking. In my mind, the fact that we can place a magnet on a table, a piece of pig iron off to the side and magnetize the iron seems to satisfy your question.
 
ewalexander said:
Can a magnetic field be projected?

I guess that is very general so to elaborate what I am asking is that could you make a device that can cause an item outside of itself to have a magnetic field? Also is there any way to induce a magnetic field in a non conductive material?
The big magnet used for the 184" cyclotron at UC Berkeley (Lawrence Radiation Lab) had a stray magnetic field up to 60 Gauss that extended ~50 feet out from the magnet. The magnet pole tip diameter was about 184", and the gap was big enough to crawl in to. The field in the center was about 2.4 Tesla, and the iron saturated at about 1.6 Tesla, so the rest of the field was essentially like a big Helmholz coil.
http://imglib.lbl.gov/ImgLib/COLLECTIONS/BERKELEY-LAB/images/96803598.lowres.jpeg
Bob S
 
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