How do you measure a magnet?

[@nonofyabidnez5737]

Wow this guy's passion is infectious!

[@VanderNugget]

Nonofya Bidnez Yes, if anyone wants to see what it looks like when a human has figured out something fantastic, it’s just after 8:00.

[@appleslover]

@@VanderNuggetyeah, more infectious than the coronavirus ..

[@gumenski]

Dang, seems like he's doing so well. And happy. It's really hard to ignore his eagerness.

[@paynebabes123]

Much yes. Tetris man.

[@StreuB1]

James' story is one of the most inspirational I have ever heard of or watched. The videos on him years ago are in part, what got me to go back to school (part time) in 2016. I am starting Calc 3 on August 20th, Tuesdays and Thursdays from 4-630pm. Yes, his story had something to do with that. :-) I think we all would love to have more videos with (now) Dr. Clewett!!!

[@lemonflavouredtnt6969]

How did it go?

[@StreuB1]

@@lemonflavouredtnt6969 I passed with a B. It was the most difficult class I have taken, but it was a class where I learned the most and had the most fun. 🙂

[@lemonflavouredtnt6969]

@@StreuB1 well done, glad it turned out well for you

[@StreuB1]

@@lemonflavouredtnt6969 Thank you!!

[@shantanubharvirkar7759]

@@StreuB1 LESS GOOO!

[@jickC8]

Who else wants to hear more about the AI James used?

[@Ceelvain]

I want to hear more James. He's so passionate. That's what make things interesting.

[@slpk]

I hear a computerphile video coming...

[@zanshin720]

Yes sir! I can't wait to see what the A.I and James has created!!! So exciting!

[@AdrianPardini]

Count me in.

[@nbme-answers]

design is likely owned by the corp but would love to hear him talk about it generally

[@c.james1]

Wow its been a while since James has been in a 'Brady' video! Overdue indeed.

[@Bas-yuru]

I'm so glad James is back, and of course he is doing something that makes him so happy and excited. More please

[@naytchh7]

this guy's excitement is contagious and makes learning a pleasure.

[@longleaf0]

It's great to see James again! Would love more videos from him...

[@MephistoRolling]

I love how excited he is about his career.

[@Smitsva]

"Large banks of capacitors which is..... storing huge amounts of energy. There's 9 kilojoules of energy in this machine." Sticks hand in machine seconds later

[@robertbloch1063]

Pure passion, even after years. Most impressive results. Awesome.

[@tatotato85]

More James!? Its been so long, so happy to see him again

[@zukacs]

congrats to this dude that he achived all he wanted later in life, remember his first vid

[@fukyougooglification]

damn i missed this guy so much, he's awesome

[@lodevijk]

I want to see that crazy coil design, or how can something seemingly so simple as a coil have a complex design.

[@crashfactory]

Agreed!

[@BrunoVanVaerenbergh]

Great to hear about James!

[@garethdean6382]

Pffft. 10'000 volts? What's so impressive abou- Wait, did he say AMPS?

[@FurryCheese999]

very clever and interesting bloke

[@manso92]

One of my favorites, awesome to see James back !!

[@ergohack]

Any time I hear someone use the unit kA in a video, I know it's going to be interesting.

[@patrik5123]

More James, please.

[@Borian]

So wonderful to see more work by James. would love to see more about this project.

[@RichardT2112]

He has such a magnetic personality!

[@Shadow81989]

I find him rather polarising...

[@1SpudderR]

Now that is really useful application of a PhD...and the owner of it is quite a genuine character no misapplied attitude or altitude just nice communicating skills. Well done for the whole interesting package. This is what “communication exchange” is all about.....And exactly what I look for Auto-didacticly when Applying My Perception Awareness expansion acquirement skills. RDR

[@Turcian]

Boy I've missed this guy!

[@avskrap]

Yay, James!

[@alijassim7015]

His job is awesome.

[@Chlorate299]

Blimey those capacitor banks are somewhat frightening to think about.

[@ElectricityTaster]

Don't worry, it's running Windows XP.

[@bruceedwards8003]

Wow I am so glad to have stumbled across this, so very interesting, I want more like this!

[@vsiegel]

The thing on the cupboard at 10:10 is not a neodymium magnet! You would not even get it off the metal by hand probably. The black is a ferrite magnet, and it seems to bee a loudspeaker magnet with a strong field across a small gap for the moving coil of the speaker, on the other side.

[@CrepitusRex]

What he 👆 said!

[@DeoMachina]

I used to work for a calibration lab, and we'd often get Hirst gaussmeters to certify! Super cool knowing James was there all along :D Relative to other gaussmeters, Hirst seemed to be the most accurate although the user-friendliness could be improved. And if anybody reading this ever buys one...take the CD out of the case! I had to explain to like, three clients that I smashed their CD's because they'd get pressed against the zero block when you closed the lid :(

[@rrni2343]

Yay! James!

[@HerrLavett]

Lovely

[@ThibaudLopezSchneider]

He's back!!

[@jonathonjubb6626]

My man Clewett, Brilliant! Always interesting....

[@heyandy889]

what's up bro, welcome back. happy to have you. :) I forgot I subscribed to this channel! I even hit the bell at some point lol

[@nottinghamscience]

:)

[@scienceandmusicmix]

James!

[@theblackbaron4119]

5:48 so if it's not shielded properly it would just send a massive emp out that would probably disable a lot of your equipment.

[@Joemama555]

10-20 kA... eh... just keep the side panel off so we can get in there to fiddle... my kind of shop! :)

[@e2theeyepie]

A new video with James Clewett?!?!? SWOON! ❤️❤️❤️

[@Ado501]

I've been asking myself where is this guy after the PhD video, finally he is back.

[@Dailymailnewz]

Can you use all that big charge to make a permanent magnet and then demagnetise it again?

[@Armuotas]

10:10 Neodymium? Not a ferrite loudspeaker magnet? I may be nitpicking here but come on. It's a silly blunder to make. Meanwhile, I'd love to hear him speak about programmable magnets / polymagnets.

[@selfhealing1047]

Yep you got it right Simple ferrite speaker magnet

[@andrewedis9907]

Dayymm there's some huge Capacitors in this video. You could do some seriously dangerous fun things with those!

[@gabehcuodsuoitneterp203]

How long do these guys live?

[@nanak3363]

He is bacc.

[@aetius31]

One question i never found the answer in books or the internet: What is the theorical maximum field for a permanent magnet? (regardless of its composition) And how close state of the art permanent magnets are from this maximum?

[@subh1]

Theoretically, I guess, if all the constituent atoms/molecules are oriented such that the unpaired electrons in them point in the same direction, that will give the strongest magnet possible for the material (see en.wikipedia.org/wiki/Electron_magnetic_moment ). May not be too difficult to calculate if you know the moment of individual atoms/molecules, the density of the material, the molecular weight, and use Avogadro's number. Now if you are asking this irrespective of material/composition, I am pretty sure that the answer is that there is technically no limit -- you just pack spin-1/2 particles (which are the elemental units of magnetic moment) more densely in a region of space to get higher and higher magnetic field density. This literally what happens in a neutron stars, although in a neutron star the neutron spins are not all co-aligned, and the insanely high net magnetic fields are probably purely due to the high density (you cannot achieve such high densities with only electrons since there will be nothing to hold the electrons together, nor with protons since the electromagnetic repulsion will be far greater than the weak force interactions). But then of course if you keep packing things more densely, it will collapse into a black hole!

[@richardevans3596]

Easy enough for terrestrial magnets. An alloy of FeCo has the highest magnetic moment density, around 2.5 Bohr magnetrons per atom. This works out to a maximum induction of around 2.5 tesla. Electromagnetic fields can now go up to 45 tesla, so much more powerful - but expensive to run!

[@virgilius1979]

How do you release all the energy from the capacitors? Do you use a high voltage high power thyristor?

[@timanderson5717]

Why is there a loop at the bottom of the graph?

[@SanMartianRover]

JAMES! I remember when you got your PhD I was so happy!

[@Joemama555]

guess he was attracted to magnets.... hehehhe

[@2nd3rd1st]

Booo!

[@LateNightHacks]

didn't you mean "gauss he was attracted to magnets"?

[@warmooze]

That intro was savage!

[@Faxter313]

So I've seen 1F electrolytic capacitors that were scary to be near to and those were only rated for 12V. That capacitor bank is crazy.

[@aetherseraph]

Outstanding

[@skarrambo1]

I have never seen a Capacitor of that order, holy Farad

[@zh84]

The farad is the largest unit in use, in terms of how large quantities measured in it are that we encounter in everyday applications.

[@heyandy889]

Jiminy crickets those are big caps

[@Patgar99]

Sir plz explain how to find out pole strength of magnet without machines by think of classic

[@nossocc]

pretty cool. What magnetics fields does he work with? i dont think he ever mentions the value. Just wondering cuz you can achieve pretty large fields in a superconducting magnet, but im guessing he needs more?

[@mussalo]

Reminds me of "Technical Error", a short story by Arthur C. Clarke...

[@crashfactory]

I think the efficiency gain he was talking about should be in motor/generator magnet usage. The efficiency input to output may not be significantly increased, but the size of that machine, or the number of permenant magnets needed could be reduced.

[@davidwilkie9551]

"The Chemistry of a Candle" seemed a bit ordinary until Faraday's explanation. Now it's Magnets.

[@Systox25]

Wow 11 months later

[@lladerat]

I've waited years for this video

[@nottinghamscience]

Hope it was worth the wait! :)

[@Faxter313]

Can we get more about those "beefy switches" for >10kA? IGBTs maybe?

[@notforwantoftrying1]

Nice video, will you ever get Markus back on the channel?

[@scowell]

Love James and James content... but that 'great hulking lump of Neodymium' was just a ferro-ceramic speaker magnet.

[@CreateWithRobin]

F---ing magnets, how do they work!?

[@LateNightHacks]

like a F---ing boss

[@theblackbaron4119]

Yeah he needs to have a sit-down and talk to the insane clown posse. Since they missed basic school education.

[@mezza205]

just some small scale testing here.. James and the teams next magnet is the earth.

[@jasper-od3dv]

Physics daddy is back!

[@MadScientist512]

Great video, this is the stuff I wish I had since playing with coilguns in high school, the first time I accidentally "broke", ie demagnetised, a 1 inch neodymium magnet was a revelation and here's the explanation. Wish he'd given stats for voltage, resistance, impedance, etc, to calculate what it could do, and he skipped over the reason for the importance of placing the magnet in the "exact centre." There were no visible security measures like brightly coloured straps across the power rails or metal mesh covers, hopefully they don't actually have it "open all the time" because that stuff'd literally blow your arm off before you could even touch it.

[@dattebenforcer]

How do they work though?

[@superjugy]

That is all nice and all, but has he beaten his Tetris record again? jk, awesome video as always.

[@durvsh]

James reviving the channel?

[@cele42]

thanks guys, i missed James dearly (still waiting on another prof. Roger Bowley video if possible, please sir)

[@dustinfisher5463]

Been a while since the last post on this channel

[@Sharndowg]

"Yeah so this small futuristic machine kicks out about 8 Tesla" meanwhile Windows XP running on monitor in background.........

[@Olhado256]

I understood maybe 20% of this video but I enjoyed it immensely.

[@551moley]

Not sure I got into double figures!

[@AtlasReburdened]

Wait, did he say that backing on the speaker magnet there was neodymium?

[@manfredpseudowengorz]

neat switch: from shaking sand to electroshocking magnets. \o/

[@Attoparsec]

No one tell him about Jevon's Paradox. :(

[@kolian98]

Excuse my ignorance ,I wonder if anybody can help me out here.I am making magnetic e-bike battery mount and wonder ,if thickness of metal mounting plate would affect the magnetic strength.Steel mounting plate+ build in magnets in the battery.Thanks

[@chrisball7335]

Technology cannot evolve ... until we first evolve ourselves

[@deuteronsmith9032]

At 10:10 he says it's neodymium. Why does it look so much like an ordinary ferrite loudspeaker magnet? It certainly came of the metal door with the ease of a ferrite magnet. Can someone at Nottingham please check the facts?

[@RobinHagg]

Fun "We keep the system open so we can get access to it all all the time, oh and here we have capacitors (that will fry you if you are not careful) ha ha "

[@RobinHagg]

Love the video

[@beeilve]

A quick Google search tells me global CO2 emissions in 2018 were 36.2 gigatons. Dr. Clewett claims we can reduce global CO2 emissions by 3 gigatons annually (8% of total global emissions) just by improving current electric motors? It's not like modern electric motors haven't been worked on extensively... Is this accurate?

[@raykent3211]

I share your skepticism. He talks fast and makes a lot of statements without explanation or justification. High quality motors are already 80 to 90 percent efficient. Sadly he doesn't state the efficiency gain. I've never heard anyone suggest that the bulk of co2 emissions are down to energy losses in electric motors or generators, so what is the comparison?

[@munis002]

More like Dr James Clewett

[@mechfeeney]

But how do they work?

[@WilliamBoothClibborn]

Oooh it's been so long!

[@robgoodsight6216]

With a wooden/ fabric tape measure!

[@microponics2695]

With a ruler.

[@jamesdriscoll9405]

Those cap banks are huge. Have you hooked it to a rail gun yet?

[@gabest4]

9:20 No one saves the planet by making motors more efficient, it just gives us opportunity to run more of them on the same energy budget.

[@leeloogalaxy]

At last!!! The real life Tony Stark ⚡❤🙌

[@utoothheartyeight]

re title: With a ruler?

[@Joemama555]

i guess you can have computers in a magnet factory so long as you move them around verrry slowwwwly?

[@NoobsDeSroobs]

I am actually surprised the wires dont spark at that distance.

[@superdau]

It's only 3kV. At typical values for air it wouldn't jump more than a 1mm gap (yes, one millimeter). Of course this depends on the shape of the conductors (pointy electrodes spark easier), how dry the air is and stuff like that. But the distances seen in the video are at least a magnitude, if not two above what could spark.

[@NoobsDeSroobs]

@@superdau When did it say that it was just 3kV? I was under the impression that he said something in the tens of kilovolt, but I might be mistaken. That is why, since the spark can jump about a centimetre per 10kV from a needle(I think), the edge should be arcing. As I said, I might be mistaken, and that it is just a low volt, high current system.

[@superdau]

@@NoobsDeSroobs He was talking about tens of kA, not kV.

[@bajer111]

Ten minutes ago I thought: I wonder how that tetris-guy is doing. James something. I think I'll give him a search. And what do you know. New video a few months ago.

[@extrastuff9463]

I wonder what Mike from Mike's electric stuff would do with such a large capacitor. He'd probably upgrade his destruct-o-tron I guess? Not that it really needs it if you'd ask me but to some people there's no such thing as overkill.

[@Joemama555]

i always assumed that magnets are made by cooling them below the curie point whist in a magnetic field. didnt know they pulsed them cold.

[@Markle2k]

That's how duplicator machines for magnetic tape storage media work. You have a metal master tape that runs continuously in a loop and then in a short section you bring your target tape close to it and zap the tape with a laser to bring the magnetic particles of the target tape up past their curie point. The target cools below the curie point and retains the magnetic field from the master. And then the target leaves and gets wound onto a spool to later be cut into sections to be loaded onto cassette reels.

[@charlieangkor8649]

the venerable laundromat capacitor.