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You can view a ferrite rod as a discontinuity in the magnetic continuum. Its presence distorts the fields present.
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This reminds me of the potential flow theory of aerofoils and vortex lines etc....the magnetic field are like streamlines. An aerofoil distorts the flow field surrounding it.
If you can tolerate the Manga animations, this explain Maxwell's four laws of electromagnetism; Maxwell was a genius. He could predict something on a piece of paper before they proved its existence:
https://www.youtube.com/watch?v=9Tm2c6NJH4Y
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For a bit of fun with ferrites and fields, look up how a fluxgate magnetometer works. Note the frequency doubling effect. Most people don't expect that the first time they meet the things.
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Sweet.
Hypothetically speaking, if I were a greedy career criminal and my long-life ambition is to rob the house of a billionaire or the gold vaults of the Bank of England. Can i use the fluxgate to locate the position of the hidden safe or the bomb proof vault?
https://www.metrolab.com/technology/...%20the%20other.