Magnets almost seem . . . . magical.
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25-10-2013, 08:39 AM
Magnets almost seem . . . . magical.
So . . . where I work, the IT guy gave me some degaussed harddrives so I could remove the rare earth magnets in them. The degaussing did nothing to the magnetic field of the magnets [of course]. But while experimenting with these magnets, I couldn't help but ponder the "nearly magical" properties of them. I held a key [non-ferrous] with a key ring [ferrous] close to the magnet and the pull on that ring was as if someone else [invisilbe] was trying to pull the key out of my hand.

Now, I know there are physical principles at work, but the "seemingly magical" properties of an unseen force either pulling two magnets together or pushing them away [especially rare earth magnets] is quite fascinating. It makes me wish I could actually see what was going on. Not merely a diagram, but actually see the interaction.

Anyway, just a topic to discuss the fun with magnets.
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25-10-2013, 08:40 AM
RE: Magnets almost seem . . . . magical.



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25-10-2013, 08:47 AM
RE: Magnets almost seem . . . . magical.
[Image: icp_how_do_magnets_work.jpg]

[Image: dog-shaking.gif]
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25-10-2013, 09:16 AM (This post was last modified: 25-10-2013 09:20 AM by Hafnof.)
RE: Magnets almost seem . . . . magical.
Here are two of the clearest descriptions I have come across, both for fixed magnets and electromagnets:







If you're interested in seeing how magnetic fields move, search for "ferrofluid":



They work like iron filing following the magnetic field lines but are a bit more mobile and interactive.
Conventional iron filings demonstrations can also be worthwhile:









Give me your argument in the form of a published paper, and then we can start to talk.
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25-10-2013, 09:32 AM
RE: Magnets almost seem . . . . magical.
hafnof, . . . I actually did a small experiment with the tiny grindings of metal on one of the rare earth magnets. When in the middle of the magnet, they lay down flat. If I push them closer to either end, they will stand up straight. I've seen some of the ferrofluid sculptures. Above fascinating!
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25-10-2013, 10:04 AM
RE: Magnets almost seem . . . . magical.
I used to fuck with my kids with this one. Big Grin




As it was in the beginning is now and ever shall be, world without end. Amen.
And I will show you something different from either
Your shadow at morning striding behind you
Or your shadow at evening rising to meet you;
I will show you fear in a handful of dust.
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25-10-2013, 10:30 AM
RE: Magnets almost seem . . . . magical.
Cool, GirlyMan!
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25-10-2013, 10:56 AM
RE: Magnets almost seem . . . . magical.
(25-10-2013 08:47 AM)kingschosen Wrote:  [Image: icp_how_do_magnets_work.jpg]

[Image: equation_rectangle_magnet.jpg?height=460...;amp;qv=90]

[Image: 3d366d5c-72a0-4228-b835-f404c2970188_zps...1381867723]
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25-10-2013, 01:05 PM
RE: Magnets almost seem . . . . magical.
Macroscopic magnetism is pretty simple. No divergence, but magnetic fields arise from motion of electrical charge and time-varying electric field.

Now, statistical mechanically speaking, magnetic properties (ferro-, ferri-, antiferro-) are a consequence of spin-spin interaction of electrons within a material.

Magnets are cool.

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25-10-2013, 02:36 PM
RE: Magnets almost seem . . . . magical.
Keep the magnet stuff coming. Great stuff here, guys! :-D
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