Neodymium Magnet Polarization


by RestlessMind
Tags: magnet, neodymium, polarization
RestlessMind
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#1
Aug19-09, 09:11 PM
P: 174
Do neodymium magnets polarized like this and with this same shape exist?

http://upload.wikimedia.org/wikipedi...Bar_magnet.jpg
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negitron
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#2
Aug19-09, 09:39 PM
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http://www.magnet4less.com/product_i...roducts_id=649
Phrak
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#3
Aug19-09, 09:57 PM
P: 4,513
If you happen to salvage a Neodymium magnet out of a hard drive it will be a quadrapole...

RestlessMind
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#4
Aug19-09, 10:09 PM
P: 174

Neodymium Magnet Polarization


Thank you!
RestlessMind
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#5
Aug19-09, 10:11 PM
P: 174
Hey, a quick question for anyone that knows... in these rules on that site...

# Neodymium magnets are brittle; they can be broken or can splinter in a collision. One should wear gloves and protective glasses when handling these magnets, because splinters could disengage and fly from the magnets.
# Normal Neodymium magnets will lose their magnetic properties if heated above 175F (80 C). Higher temperature rare earth neodymium magnets are available in our store.
# The strong magnetic fields of neodymium magnets can damage items such as television, computer monitors, credit cards, bank cards, computers, diskettes and other data carriers, video tapes, mechanical watches, hearing aids, loud speakers and VCRs. Pace-makers may be damaged or switch to "Test Mode" in the presence of a strong magnetic force, if a pace-maker is in use, keep a minimum of 3 feet distance.
# You should avoid having constant contact with magnets of any size and keep a distance of at least 3 feet to large magnets.
# Children should not be allowed to handle neodymium magnets as they can be dangerous. Small magnets pose a choking hazard and should never be swallowed or inserted into any part of the body.
# Under no circumstances should you try to cut, saw or drill the Neodymium magnets! Not only would the magnet break, but the resulting dust from the magnet is very flammable. Neodymium magnets should never be burned, as burning them will create toxic fumes.

Why does it say to stand 3 feet away from large magnets? o_o
Phrak
Phrak is offline
#6
Aug19-09, 10:37 PM
P: 4,513
Quote Quote by Draven View Post
Hey, a quick question for anyone that knows... in these rules on that site...
...
Why does it say to stand 3 feet away from large magnets? o_o
Because they've been burnt by a lawsuit or have lawyers employed to keep them from being burnt. You're reading the disclaimers to protect them from all this.
RestlessMind
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#7
Aug19-09, 11:00 PM
P: 174
Quote Quote by Phrak View Post
If you happen to salvage a Neodymium magnet out of a hard drive it will be a quadrapole...
Wow, I had no idea those existed.

Because they've been burnt by a lawsuit or have lawyers employed to keep them from being burnt. You're reading the disclaimers to protect them from all this.
Ah...
iansmith6
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#8
Aug19-09, 11:12 PM
P: 3
Quote Quote by Draven View Post
Why does it say to stand 3 feet away from large magnets? o_o
Weird. Why buy them if you can't get near them, indeed.

However, some large magnets are very dangerous. I own several that could break your fingers if you let them get between a pair. And even small magnets that look harmless can give you a nasty pinch and resulting blood blister or crushing injury.

-- wwww.ian.org
Phrak
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#9
Aug20-09, 12:01 AM
P: 4,513
Re: quadrapoles.

Quote Quote by Draven View Post
Wow, I had no idea those existed.
I see this could be confusing. There are two north poles and two south poles. It just happens to be the arrangment that is best for moving the read/write arm over the surface.
RestlessMind
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#10
Aug20-09, 02:31 PM
P: 174
However, there is no such thing as a magnet with one pole. Correct?
negitron
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#11
Aug20-09, 02:41 PM
Sci Advisor
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As far as we know, no.

http://en.wikipedia.org/wiki/Magnetic_monopole
RestlessMind
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#12
Aug20-09, 05:44 PM
P: 174
Oh I see, that's cool.


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