Eddy Currents and Lenz's Law

[Powerflybatman]

Great explanation to set the foundation of the idea

[MisterWrinkles]

Video is wrong.

The induced field doesn't oppose the external one. Changes in the induced field oppose changes in the external field. The induced field produced by the current loop above the magnet is wrong. The induced field should ATTRACT the falling magnet to try to slow the fall.

[RyanDidGGsMum]

@MisterWrinkles ...? I'm screwed.

[ThexBorg]

Great demo dude.

[coldbloodedfilth]

get a camera braw

[joblagz]

fuck the vid cam.. pictures just works better..

[queeniemuah]

The explanation was very nice and clear. Thank you!

[arasretep]

This is a really good explanation. You should remake this video exactly as it is but with a video recorder. It would just seem more "flowy".

[kelvinoalbino]

Calm down, video cameras didn't exist in 2009. Anyways, that helped a lot, thanks.

[Blov1109]

thank you that helps a ton

[Darow94]

thanks you helped me with my upcoming finals

[TheSaltysack]

hey do you thick that aposing magnetic field is antigravity like using aluminum and a 240 tune coil by tunning it to the right frequency it will lighten in weight this is said by senior boyd bushman he worked for lockheed martin its on youtube just type boyd bushman

[erikmaguina]

hey wats tha special paper u used?

[Ursenfuns]

There were no camcorders back in 2009. yeah, oooold times :o

[TheWwweee]

@Ursenfuns you are wrong :)

[Zobaire90]

so, in order for a currnet to be induced there has to be a complete circuit. which is why there was not current induced in the broken loop?

[Lagonz2000]

This is one of the must scientifically beautifull videos I have seen.

THANK YOU!!!!

[veggievampire360]

Where do I get some of that paper?

[luarkas]

The schematic shown on 3:13 min does not explain why the broken loop does not repel the magnet

[debwl]

with these diagrams & prac illustrations i have understoood the eddy current, it's now clear to me.

[71296105195]

eddy currents are cool and need to be explored

[babybouncerproject]

If the eddy current direction is as pictured in the diagrams, how would cutting a slit in the longitudinal direction suppress the eddy currents? Are the eddy currents not supposed to be concentric to the tube?

[Song4Alex]

great videos I like how carlos explains

[LTF85199]

i agree this slide show was annoying.. video would have been better

[speed12125]

wonderful explanation

clear concise, and helped me greatly

much thanks to you guys keep up the great work

[wow1022]

eddie currents... the reason why we use laminated iron cores in transformers

[mjmidhunmj]

Very helpful.............

[buchengoodwin]

Very good explanation. I’ve been playing with a copper tube myself. I split my tube length wise (“breaking the circuit”) and expected my magnet to fall fast. Crazy thing is that I still see the induced slowing! ???????

[plentyofsound]

you saved me for my test

thankkk youuu

[thatsomebody7]

The diagram explained it all. Kudos for the video!

[madnesswrap]

it all came together for me thanks to this video. you guys are the best!

[sharpierainbow]

THANK YOU THANK YOU THANK YOU!! I am now passing my physics summative because of you!!

[littleeSindyy]

but i don't get it, how is a current produced when there is no complete circuite? please help me!

[janitarjanitar]

@littleeSindyy

... theres NO current produced in an 'open loop circuit' watch the video again

[piper4seeformerly]

Thank you very much that was very interesting.

[23youwatch]

the lady is a lil to fast... Carlos is perfect pace

otherwise awesome!!!

[IParkeStudios]

Can anybody tell me the name of the special green paper that displays the fields of magnets? 1:55

[ritesh1447]

very impressive and effective explanation and the diagram is really good

[stonzzess]

how can 1 make eddie flow bigger/stronger??

[unhinderedfury]

@stonzzess you can make the currents larger by having something that produces a stronger magnetic field (electromagnets) or move faster, as the magnitude of the eddy currents depends on the rate of change of the magnetic field

[bhavul]

Thanks a lot. :)

[smellslikepanda]

you are a legend.

thank you :)

[brianjo928]

YOUR DIAGRAMS ARE AMAZING! I went through numerous texts and explanations to understand the induction law, and your diagram at 0:40 just gave me a sudden ephiphany. Thanks a ton!

[MsRainbowguitar]

it's very good but my problem is that i wanna have it for a presentation in school and i am german and i can't find such a good version explaining this in german :(

[HorizonDelta]

Good alternative science! Also watch: "Wonderful electric energy" by HorizonDelta ;-)

[WonderWatcher1]

Is this what's going on when a superconductor is shown floating stationary?

[oOfretlessOo]

Thank you!

[AcePilot101]

Excellent presentation!

Now try this with an aluminum can. If you wave a magnet over a non-magnetic soda can, the can will rock back-and-forth due to Lenz law.

[stevjen1]

Did God create this? Ah don't think so!!!!!!!

[thehuntfortruth]

You are awesome this video was very helpful! Thanks so much

[s4759]

Could someone please tell me whether the yellow line represent electron movemnt (normal current) or positron movement ( conventional current ) ? Thank you.

[abebrown92]

fantastic images!

[bRandom79]

This video at 30 sec is incorrect... the magnetic field of the bar magnet in red should be exiting the south pole and entering in the very center (between n and s poles) where the vortex created by the field changes from right to the left and it exits the very center to continue out and around to the north... looks like a 4 leaf clover...if you need extensive scientific verification of this look into the work of Albert Roy Davis and Walter C. Rawls... really good and important stuff!

[NARUTOVIDEOMAKER4LIF]

this is very good ..its an educational thing!

[davie4monster]

Not only that, the "picture making" process of the male mind is constantly being interrupted in this video. Interrupted by the "word story" conception of the female mind, as it comes, quite interruptively, from the female speaker, the message from the woman here. This is all so basic. Do these people really deserve to have Jobs..?? Does this company Deserve to make Educational videos..??  Does any-one listening foolishly insist that what I'm saying here is Sexist, in it's pejorative sense.?

[davie4monster]

Seriously, the female voice is not a good hormonal environment for the male mind. Unless you are a homosexual. Why don't you guys Know this.?

[adamz1988]

nice

[rolandas1985]

Please make wheel with inside ferro fluid, and outside make coil like 4-th dimension. Try or it works. :)

[GTSRBOY]

you should invest in a video camera.

[1emu3e]

nice job, tnks

[trailkeeper]

When you drop the magnet through the pipe, would an ammeter connected to the ends of the pipe show any current?

[iPaper100]

thank you :)

[Losuol]

You sound like my econ prof haha

[lecorfec]

Nice description but a bit confusing!

The description of Eddy Current at 3:13 does not explain why a broken loop would prevent the braking effect...: you even provide a description of "braking eddy current" in a half loop! Strange, strange!

[henrykay01]

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tel. +48-512-933-540

[StaticShock13]

Thank you for this video, it is very helpful

[narivasant]

I left something out. You need a low frequency AC source for the external magnetic field because all the spins will flip and then you resonant them and flip them back the other way. Back and forth, over and over, all the while with the spin waves radiating EM that reflects back as reinforcing even from the antenna that taps off the power. It doesn't violate energy conservation. It demonstrates an energy exchange among all matter all the time, that resupplies the spin angular momentum.

[narivasant]

Placement of the "receiving" antenna must also be such that CEMF reflected from current through the antenna will be delayed a total of 1/2 wave length also.

[narivasant]

You have to adjust the phase of the stimulating antenna so as to make spinwaves that propagate around the magnetic film ring and adjust the distance from the copper wall so that the reflections are reinforcing where they meet back up with the ring. Bulge out the center of the copper cylinder to keep more EM energy within the cylinder rather than escaping out the top or bottom.

[narivasant]

Place a ring of recording tape spaced away from the wall 1/4 wave length of the natural frequency of precession of uncompensated electron spins (ferromagnetic resonance), set by an external magnetic field. Then with a small stimulating signal you can cause the electrons to radiate from their precession and their reflected signal, after 1/2 wave length at return, become reinforcing rather than inhibiting. Then with an antenna, tap into the larger signal that develops and use the EM power output.

[jexphe2k]

Edward Leedskalnin Law : Once you get the North and South magnets chasing its own kind of Magnet, the Magnetic current will not stop unless you break the Current.

[patricia270661]

thank you!

[CollieDogish]

This is really clearly explained, and helps so much! Five stars!

[khalfn]

cheers, helped alot!

[OldSchoolSkill]

This is a good concise video with inexpensive physical examples and clear illustrations. The results are instantly visible. No time is wasted. Any student or teacher can perform these experiments.

5 stars!

[0815tobey]

This would only be a good video if it WOULD BE a video, but those are only pictures.

Why is this???

[YummyVixiin]

is there a different name for Eddy currents,,?

[TheJawsusNSexmanShow]

@YummyVixiin

Franky's Current

[SuperMagnetizer]

I stand corrected. I did the experiment with the open and closed aluminum loops, to see if Lenz's law applied in both cases. Using a Neo magnet, both loops are affected. Eddy currents do appear, even in the loop that is broken. Sorry for the confusion.

[zynot91210]

Thats nice, pitty they ask a question like that in our exam and use the same reasoning you use just below...and mark you wrong... bastards.

[rrawwbb]

If the eddy currents don't require a closed loop, then why doesn't the magnet passing through the open loop (at 3:16) cause rotation. If they do, then how are the eddy currents and radial current related?

[SuperMagnetizer]

My experiments confirm that both the closed and open loops cause eddy currents, as evidenced by deflection of the device in both cases. But the closed loop causes eddy currents through the entire loop, whereas the open loop allows only small eddy currents in the sides of the loop, so the deflection is minimized.

[SuperMagnetizer]

Your eddy currents, and therefore the magnetic fluxes surrounding them, are drawn wrong. In reality, the eddy currents flow all the way around the tube in cross section, not just within the tube walls. This is why the broken ring toward the end of the demonstration induced zero eddy currents, but the complete ring did induce eddy currents. Everything else is correct.

[lesotl]

The "explanaition" picture (at the min.3:13) tells me that EVEN a broked ring should oppose (less, but still - oppose!)

Does it depen on the geometry of the ring? (thicknes diameter wide)

Here is another Question: Do those Secondary magnetic fields induce AGAIN currents..? (and the third induced I induce again?)

I've seen another clip with a cut coper pipe and the magnet iu slowed..

[hershorn]

Hey I have a dumb question. I understand the video perfectly, and I am able to use the left-hand rule to follow along with the direction of the magnetic fields and electric fields. However, I am confused on one aspect. If the secondary magnetic fields produced by the eddy currents are slowing down the magnet, why don't they hold the magnet in place? (i.e. why does the magnet keep falling if it is being pushed up from the bottom and pulled up from the top??) Thanks for any help guys!

[Quinzio]

If the magnet stopped inside the tube, there would be no moving magnetic field, hence no induced eddy currents, and hence no opposing magnetic field.

So it is necessary some moving speed to slow down the magnet speed itself. It is a wondeful speed regulator.

Think about a parachute. If the man and the parachute are not falling (speed = 0) the parachute won't have any dragging force opposing the gravity force to slow down the parachute and the man.

The parachute is another speed regulator.

[ArtistBlade1972]

@hershorn It requires a changing magnetic field to induce a current in a conductor. If the magnet stopped there would be no eddy current hence no magnetic field. Also as a side note, efficiency would never allow the magnetic field produced by the eddy current to match the strength of the magnet that created them...

[kuroshe1]

That is not true even in broken one eddy current is induced but not as much to be able to oppose the magnet.after all the second loop is also a conuctor.

[666tich88]

ex vid

[GNoodle]

FARADAY'S law?!?!? yeahh!

[TheRealVerbz]

The Searl Effect

watch?v=z8qvSNkiB9M

JohnSearlStory com

[99rhetbaboons]

omigod! What happened to your voice!?

[sargeantneo]

VERY GOOD explanations and analogies with good graphics, but it would be much better with a video, even if it was poor quality, it is better than a slideshow.

[eebamxela]

Excellent explanation. Where's the video??