Neodymium Magnet Polarization

RestlessMind

Do neodymium magnets polarized like this and with this same shape exist?

http://upload.wikimedia.org/wikipedi...Bar_magnet.jpg

negitron

http://www.magnet4less.com/product_i...roducts_id=649

Phrak

If you happen to salvage a Neodymium magnet out of a hard drive it will be a quadrapole...

RestlessMind

Thank you!

RestlessMind

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 175°F (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

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

Wow, I had no idea those existed.

Ah...

iansmith6

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

Re: quadrapoles.

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

However, there is no such thing as a magnet with one pole. Correct?

negitron

As far as we know, no.

http://en.wikipedia.org/wiki/Magnetic_monopole

RestlessMind

Oh I see, that's cool.