Eddy Current Tubes

[kemup]

these idiots divided by 0

[darthspeaks]

Lenz's Law in action! Interesting!

[samsplumb]

That was really cool to watch. I'm currently learning about Lenz's law in my college electronics class.

[straighter100]

O MY GOD.........EDDY CURRENTS!!!!!

[flamboyanza]

I just answered it perfectly through reasoning in one of the questions from Griffith. But now that I see it, wow! It's so pronounced...I just didn't know..never tried, even at lab. Great effect of eddy's current :)

[LoserSVK]

Which way should be the magnet magnetized? And how to calculate opposite force by eddy currents? Thank you

[Oshyrath]

The explanation of how it works... The science behind it... According to Newton's... Shit, this thing is magic.

[MortimerKahn]

Fucking magnets! How do they work?

[Creoleatheart]

MIRACLES

[akithered]

Oh My God... What is THIS?? I can stand talking dogs, flying fishes and invisible dragons, but THIS?!? The world's end is near.

[Lacusness]

1+1= 3.142

[kickit246]

1 + 1 = a window, derp -.- Come on guys, this is kindergarden stuff...

[Rad2Con]

Actually 1 + 1 = 1.9 repeating

[xXBioscarsXx]

ACCTULY 1+1= 1 on a bun!!!!

[colt6021]

actually 1+1=fish

[kowspot2000]

Yay EM Induction!

[Darkeh112]

@RhinoSanderson Actually 1 + 1 = 0.

[Halopedian]

can this be done with any kind of magnet or does it have to be a certain kind?

[RonBurgundy161]

Fucking magnets.

[NineTailsDemonFox]

I'm just going to use this video as a point of reference for the World of Warcraft daily quest: Magnets, how do they work.

lolz

[pokerocket]

fuckin magnets how do they work

[TheScurvyNinja]

I find it so odd that the effectiveness depends entirely on whether or not the tube is solid.

[Dethmasheen]

GODLESS TECHNOLOGY! IT'LL CREATE A RIFT IN REALITY AND DEMONS WILL RAPE YOUR SOUL!

I'll so try this!

[bigjblaster]

thats gay

[douro20]

Do it enough and it'll get warm.

[uSee218]

Ohh my fucking awesome

[PoopsMaster]

fall?

2. can you foil the tube with more than 1 wire? that means you will do a bit messy job and maybe some wires wont go so perfectly round the tube

thanx in advance!

btw im talking about taking the tube out from a toilet paper

[monstercameron]

free fall elevators



[TheLorriLippittmzu]

heycant seem to find a guy who isnt a coward

[JacobH420]

@TheLorriLippittmzu im no coward

[MrSpartan212]

DAAAAAANG! EPIC! =D

[xelanahc1]

that is so cool! just learnt about the physics of this stuff last week,

[blah23ist]

all u guys are dumbasses. im 13 and i know how it works

[bazzarr]

That's oddly relaxing to watch.

[rroge5]

is that just a copper pipe and a strong magnet?

[dmolloy36]

How can i buy one of these???

[anApparition]

If the pipe was a superconductor and the geometry allowed no loss of flux, you'd let go of the magnet within the tube and the magnet wouldn't fall at all but because there are losses (heat loss from current in the copper pipe and imperfect flux coupling between the two), the magnet falls....although much slower than it would normally fall.

[wildinthestreets86]

hell yah... i did and its awesome... make sure you clean it real good.. you don't wanna to get rusty with the cum all over it..

[godsinarms]

GENIUS

[maljalcol]

ty abram and for the rest stop eb9ing stupid and read it

[123leevus123]

SOMETHING SLOW

[darkgear6]

1+1=4

[vlinderbom2]

@darkgear6 1+1=11 -.-

[MrZeus7]

Pretty cool demonstration of one of the things that Lenz' law allows for!

[theultimategreatness]

reading the description hurt my brain

[flyingmen2]

im 12 and i know what it means

[laserhighfive]

quit lying

[flyingmen2]

im not!!! children are supposed to be innocent :P

[jjccccc]

cool and im not sure why

[HedfoneDrumAndBass]

yeh you see all the hater comments who hate fags like you :D

[livewire242]

Fake.  Magnetism is a hoax perpetrated by jews.

[mrcoolbp]

Not Jews, Televangelists. Common Mistake. I accept your apology.

[josefelipe3]

É o demonio!!!!!

[deemon710]

Read description.

Brain hurt.

Diagrams please.

[wbeaty]

Sweep a magnet pole across a conductor, and "magnetic drag," or "inductive braking" happens. The magnet gets slowed down. (It's much the same explanation as levitating a magnet over a superconductor.)

With neo supermagnets the effect is easy to see. The effect is almost insignificant with cheap older magnets (ceramic or alnico.)

[wbeaty]

Thrust a magnet pole into a coil, and nothing happens UNLESS the terminals of the coil are shorted together. In that case the moving magnet "pumps" the movable electron of the copper into motion. The electron-stuff inside the entire coil starts flowing slowly like a flywheel.

But... if you have a current in a coil, you have an electromagnet! The coil creates it's own magnetic poles which repel the incoming pole being thrust in.

The magnet "feels" friction, but only the coil gets hot.

[abram730]

Electrons carving new paths creates heat. Test by putting an electromagnet in a conductive tube... heat will be generated in the tube as the electromagnet is turned on without movement of the electromagnet.

The resistance is the same thing you see holding up superconductors over magnets only in superconductors the difference in flow resistance is greater then the pull of gravity.

I'm not sure if I'm the first to say this, but if so it's my theory.

[abram730]

the magnet flows from the magnet goes threw the tube as it offers less resistance. This causes electrons to spin around the tube. as the electrons spin around the tube they carve out channels that alters the magnetic field creating a path of less resistance. The electron spinning around the tube also make a magnetic field that adds force to the magnets flow almost as great as the pull of gravity.

there is sort of a magnetic Jacobs ladder effect of new flow paths being carved.

[abram730]

meant "the magnetic flows" not "the magnet flows". By "this causes" This is the magnetic field flowing threw the conductor and transferring spin energy to the electrons..

I condensed too much but it's a 500 char max.

[Coldod23]

@abram730 lol wtf... which electrons? if u dunno wat ur talking about then dont write it :P

[kubicam]

Just go buy some rare-earth magnets and a copper pipe.

[chamanista]

WOW

[Orangeflava]

why does it fall so slow?!?!? can someone explain in layman's terms?

[AirplaneFoods]

I've spent a year now taking university level physics and I've only learned Lenz's law recently - the description is about as "layman's terms" as it will get =T

[Orangeflava]

ok thanks for the response! i suppose i will analyze the text and try to better understand. peace!

[angeltroea]

wat

[omykron23]

So sexy

[PiperTheGreatX]

that's weird, it looks like ant-gravity, but not

[cool7654321]

coolio!

[JapsEye2]

Who is Eddy Current?

[swwigy]

Edward Current... yea he's a real guy.

[JapsEye2]

Wow. Is he the physicist who discovered that when a conductor is exposed to a changing magnetic field due to relative motion of the field source and conductor; or due to variations of the field with time, this can cause a circulating flow of electrons, or a current, within the body of the conductor?

[swwigy]

No, he talks to Jesus.

[DrMattDestruction]

don't shoot me! i have the package!

[cosminx2003]

nice

[d4m4s74]

if I remember my highschool physics class correctly the magnet passing trough creates an electric current which causes a magnetic field in the opposite direction

[angeltroea]

this guy got to go to school

[fherdito]

nice!!!

[llahiru]

wow!

[DJCatylist]

no, no I just wont believe it. I say we burn him at the stake and watch the devil pour out of him!

[Nyscerion]

super...

[ArtisanTony]

This video was so long i fell asleep could you make it a little shorter next time goober

[Ree8ok]

sprawia wrażenie, że pierścień zwalnia spadając wewnątrz tej rurki.

[Dudhwalla0514]

It's better than a joke. It's Physics! =)

[baconeater]

Did Edward Current invent this contraption?

[benchanlol]

lol. that's a joke right ^_^

[christiankarlsson]

Good question! I don't know, but yes i guess it must be "heavier"...

[Olej1906]

nice

[jmfgegr]

I just jizzed my pants

[nrgianni]

Aaaaaaaaagh!

[SychoticClown]

OMG a magnet falling through a tube! That has to be fake!!

You guys should've seen that one time I threw a rock in a well. It just...fell. In that tubular thing. Bet that would take your breath away.

[Addrox]

youo are either an asshole or very stupid.. can' you see the slow speed it has when falling?

[pechapowiec]

look at the magnes and his arm :)

[SychoticClown]

Ack, I did not notice the speed. Sorry!

[wbeaty]

That looks like the version I sell at Puyallup Mike&Key hamfest. I buy the tubes as scrap at Alaskan Copper, and the magnets from supermagnetman page. But it's easier to just order them from teachersource page (and they have a cheaper aluminum version. The speed is only slightly faster.)

[nonglotter]

ooooh!

[Kitscoma]

You just blew my fucking mind..

[musiccalgary]

It's not fake and it's not magic. It's just nature. :)

[wbeaty]

Nope, it's for sale in physics teaching catalogs. The "Lenz law" demonstration of reaction force during magnetic induced currents in conductors.

My boss in a science exhibitry company invented this particular version in 1989 (the wide-tube, thick-wall version using supermagnets.) Dropping bar magnets through copper water pipe has been used in physics class for decades.

[venomx2]

You're obviously fake or magic.

[jessi330]

Science. It works, bitches.

[ryanlaing]

fake, slow motion camera effects until passes through, audio is dubbed in. i could do this in 5 seconds in final cut pro.

[SeraphicSin]

You can't seriously believe that.

[Jackalwolffe]

Challenge not the laws of physics.

[CaptainMazda]

Actually this is what they use to make internet tubes, very simple stuff really.

[goblinm13]

Yes.

The magnet falling through the tube causes a magnetic flux which the tube opposes (via eddie currents). The opposition of the field generates an electromotive force on the magnet, causing it to fall slower. The tube exerting the force is subject to newton's third law, "To every action there is an equal and opposite reaction." So the generation of the upward force on the magnet causes a downward force on the tube. This downward force causes the tube to feel 'heavier'.

[ZenithPlacidity]

part of the weight is being acted upon while it is falling to the earth and part of the weight is felt in the hand of the person holding the object (though it is likely subtle)

What I'm saying is, the percentage to which the magnet is slowed down from the rate at which normal objects fall, i thin -9.8m/s^2, would be the fraction of weight added to the weight of the copper tube.

[ZenithPlacidity]

For example:

suppose the magnet is only falling at -8.82m/s^2, that would mean that it is only falling at 90% of the speed that it would if it weren't experiencing this phenomenon (-9.8m/s^2)

so suppose the object weights 25 grams, only 10% of its weight, or 2.5 grams, would be added to the copper tube and felt by the person holding it.

Basically, energy is being distributed proportionally to the way its physically interacting...

(I made all of this up, but it sounds intuitively correct)

[wbeaty]

> What I'm saying is, the percentage to which the magnet is slowed down from the rate at which normal objects fall, i thin -9.8m/s^2, would be the fraction of weight added to the weight of the copper tube.

Exactly. And since the magnet decellerates to zero (constant speed) within the first couple cm of falling, the entire weight of the magnet is felt by the hand holding the tube.

[takeda64]

Yes, it's failing slow because the magnet's magnetic field interacts with the magnetic field generated by the copper tube. It's kind of like if you had a tube with a water flowing in the opposite direction of the magnet falling. The weight of the magnet would then be pushing on the water, and the water would be pushing the tube down. Not sure if that analogy explains it a bit better or actually confuses...

[trav563]

wait what if u flipped the tube before it got to the bottom...would it just stay in the tube and keep falling if u keep flipping it

[jedus1]

In 1978 the Portuguese Mafia used eddie curent damping to kill my dog. Luckily it got better.

[crazy8rgood]

Haha

[DrKra]

I won't answer that since others already did, but it's not a stupid question at all.

[fotune]

OMGWTF! TIS IS INSANE! I watched this thirty bazillion times and its still so cool...

[ayeroxor]

simply put, since the tube is "pushing up" on the magnet, the magnet will be "pushing down" on the tube.

[electrictape22]

I just tried this. It is awesome

[netenute]

I want one!

[wbeaty]

Yep, and you can put the tube on scales to see it happen.

Since the falling magnet is moving with constant speed (not accelerating or in free fall,) all of it's weight is coupled to the copper. Or just wave your hands and say "Newton's Third." The upward force which slows the magnet and makes it fall constantly, must be identical to the downward force on the copper tube.

[tuxtehcrusher]

also, the tubing used has to be non-ferrous (no iron in it), yet still conductive, otherwise the magnet would just stick to the side and nothing would happen. In this case, the assembly would be heavier.

[Franqui]

that's so f* cool