Tags for this video have been changed from 'electro magnet, magnet, strong magnet, science, iron, emf' to 'electro magnet, magnet, strong magnet, science, iron, emf, lenzs law' - edited by rottenseed

http://en.wikipedia.org/wiki/Lenz%27s_law

Wowee. Right up my alley.

I looked up this design on the wikitube. It's a design called the bitter magnet, named for its inventor (1933), Francis Bitter:

The strongest continuous magnetic fields on Earth have been produced by Bitter magnets. As of 2011 the National High Magnetic Field Laboratory in Tallahassee, Florida, USA, houses the world's strongest resistive magnet. This system has a maximum field strength of 36.2 teslas and consists of hundreds of separate Bitter plates. The system consumes 19.6 megawatts of electric power and requires about 139 litres of water pumped through it per second for cooling.[2]. This magnet is mainly used for material science experimentation. For similarly designed examples of bitter coils see the external links below. The strongest continuous manmade magnetic field, 45 T, was produced by a device consisting of a Bitter magnet inside a superconducting magnet.[1]

@rich_magnet Thank you for that, I changed the tags because of such.

[insert ICP reference here]

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?

>> ^Payback:

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?


Because they dont. Or do they ? ? ?

>> ^Payback:

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?


I think that sometimes they do, but magnetic fields loop, so power doesn't necessarily mean range. I think range just depends on the size of the magnet.

The presenter, Robert Llewellyn, also played Kryten in Red Dwarf. He wasn't quite so coherent last time he was this close to powerful magnets:

"My short-term memory has been erased. This, I ascribe to the proximity of the magnetic coils from Starbug's rear engine. Secondly, due to the proximity of the magnetic coils, my short term memory appears to have been erased. This, combined with the erasure of my short-term memory, has left me a little disoriented, disoriented, disoriented."

>> ^Payback:

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?


The Tesla unit measures magnetic flux density. The density of the Earth's magnetic field is very low compared to this magnet but it has much more total energy (no idea how much) and we're always within its field whereas this magnet might affect compasses for a few hundred feet.

>> ^Payback:

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?
the strength of the field falls off inversely with the cube of the distance from the magnet's center.

I feel the need to shamelessly self promote my earlier vid, as it is quite relevant: http://videosift.com/video/The-Meissner-Effect-Awsome-physics

>> ^juliovega914:

I feel the need to shamelessly self promote my earlier vid, as it is quite relevant: http://videosift.com/video/The-Meissner-Effect-Awsome-physics


I as well ! http://videosift.com/video/Meissner-effect

fail science. you don't need a metal rod to make an electromagnet.

So why is the bigger magnet too big to even look at? Does it pull the iron out of your blood through your eyes or something?

>> ^Payback:

Uh... if these magnets are so damn much more than the earth's field, why do compasses not point at them from several miles away?


I guess what I meant to say was:

Fucking 45 Tesla hybrid electromagnets, how do they work??

Magnet steroids, a difficult subject, but one that must be addressed.