Is aluminium magnetic? The simple answer is no. But in this video, I will show how aluminium actually will react in two different ways to a magnet.
Using strong magnets and sensitive setups, even soda cans will have visible reactions. Do you know both of them? And can you guess which element will roll off a magnet the slowest: Aluminium, copper or silver?
200x50 mm disc magnet, 50 mm sphere magnet and one of the 150x50 mm disc magnets donated earlier by www.magnetportal.de/
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#Magnet #SodaCan #DrinkCan
That last experiment was so awesome! Edit: Aren't these wooden wedges the same as in the old video combining two monster magnets?
Those wedges are the one you used to combine the two monolith magnets, not the used to make the 6x4 monstrosity
Nicely done. i was tired of TLDR versions that basically drop a neodymium magnet inside a copper tube. At last a comprehensive explanation that even in physics lab classes at college level is sometimes overlooked. Very well done.
When braniac75 is better in showing physics stuff then schools, that's when you know.
Magnets are the closest thing we have to Magic, awesome video.
Love me a good Brainiac vid 🙂
Thanks for the early watch, Nate :D
Same here.
My dad had some small, powerful magnets, and it was fascinating dropping them down the tube of an aluminum foil roll. It was like magic how they slowly tumbled through.
did you have to wrap a lot of layers, or is just one or two layers of foil enough?
would like to see more of these myth-busting vids!
Pure classic Brainiac magnet demos! Great stuff, thank you.
I will never get tired of magnets/magnetism. it seems like such a strange force but it effects everything differently.
I've never seen an iron/steel drink can before, that's pretty interesting
KZhead shows me less and less of your videos so I make sure to binge them whenever it shows me a new one. Always fun to watch. Never change.
I love how he changes how he pronounces aluminum every other time
I missed that. If I'd noticed, I'd have beenistening for alumium, another name it has had.
Historically, a mechanical speedometer had a magnet rotating in close proximity to an aluminium disk. The ability of the disk to continuously rotate, was restricted by a spring, so as speed increased, the pointer attached to the disk would only turn as far as the tension exerted on the spring, thus indicating road speed (plus around 10% due to a legal requirement 🤣). (An early "Smiths" clockwork speedometer, worked without magnets, possibly due to patent requirements)
And then bearings wear and magnet start to touch alu disk, needle vibrating like crazy
@@juhajuntunen7866 🤣 You don't look your age 🤣 Often, the flexible drive from the axle broke, and there was no longer any indication of speed!
@@tommiller1315 and the constant up, down, just before broke, would not of been helping
My lil cup bearings gummed up. Spray it with wd40 on the odd occasion i felt like digging, have a speedo for a week. My new bike? No abs, no speedo sensor... its on the engine speed, like most cars etc run off the gearbox. Means i cant change sprocket ratios :( Hate new stuff. Gimme things i can fix!
Always a joy to watch new stuff from you! 🥰 Do you have any plans of exploring superconductivity, or would that be too financially and safely intensive/complicated to try?
Awesome video! Demonstrations I've never seen before. This has a real world use familiar to coin collectors. Magnetic slides made of rare earth magnets are used to test coins. A silver coin will drop slower than one made of copper or brass. It's a great and quick way to test for counterfeit silver coins.
I had no idea there where steel soda cans. I heard some sodas can attack the aluminum more, but i thought that was solved with a liner spray.
I have no idea why some German soda cans are made of steel... They are all made of aluminium in Denmark. But you're right, they are (all?) lined with a lacquer to prevent chemical reactions. Thanks for the early watch!
Both have liner spray, but you can slightly taste steel cans from the exposed steel where you drink from. I actually like it though.
Since the 1935's all cans were made out of sheetsteel (iron with a bit of carbon) if I recall correctly. Mostly due production capability's. In 1965 aluminium soda cans were slowly introduced.
The last time I encountered steel soda cans was in the US Midwest in the late 1980s, a generic supermarket brand used steel cans, and seemed to transition to aluminum by the early 90s.
@@guyh3403 I assume then that the current supply comes from someone using old production equipment that hasn't broken yet. I once tried to understand which material is cheaper and why. I _think_ what i found was that raw iron starts out cheaper since it is more abundant, but aluminium is much easier to work with, so the more refinement steps there are in your production line, the cheaper it becomes to use alu over steel.
Would be interesting to see if lubrication changes the end results, if friction plays a role or not
So cool. Ive always been fascinated with magnets since i was little and they still leave me in awe. Your videos are so valuable. I love learning new things. Thanks for this and i cant wait to see more!
Yee a new Brainiac vid! These videos are always so well made and i always learn something new! Thanks for making these videos!
Great demonstration 👍
Glad you like it, Lexmax. And thanks for the early watch :)
Back in the day we were decommissioning a 7T superconducting magnet so I took the opportunity to stick a chunk of aluminum into the bore and that was a lot of fun. Also when in service pushing the evacuated metal tube of the FT-ICR into/out-of the bore was an exercise in patience, but a free hand-held aluminum block was a more dramatically weird feeling.
Conductivity per unit mass would be an interesting metric! Seems like aluminum would be near the top.
It is which is the reason its used in overhead powerlines
@@fabianradakovitz9064 True, but its not that much used because of weak mechanical strength. But we already have a solution for that with alu conductor steel reinforced cables.
I needed a new Braniac video tonight, thanks!
Great demonstration .. thanks for the knowledge...👍👍
I love your channel so glad I found it, I'm learning so much. I especially appreciate the clues you give, like on the bottom right at 6:57
Today I learned that Silver is a better conductor than Copper.
:v Learned that thanks to the audio world.
And some think gold is the best conductor of all, but it is only a little better than aluminum... Thanks for watching!
@@brainiac75 but gold terminals won't corrode anywhere near like how copper or silver, hence gold plated terminals all over.
My thanks for keeping the monster magnet tradition alive
The floating on water experiment might not work that well. The styrofoam usually gets "attracted" to the edge of the water by itself. I believe it's because of waters surface tension
I first realised this effect when, as a kid my Dad would let me loose on a pile of old scrap cars, and armed with screwdrivers, pliers and an adjustable spanner, I would strip out all the jewel lights, switches and gauges. I stripped out many speedometers and discovered that the cable turned a pair of magnets on an armature which were in very close proximity to an aluminium disc which had a clock-like spring attached to it and also the indicator needle. Fascinating! That was 53 years ago, now!
I am here to judge KZhead's recommendations Good background music Good voice Decent visual examples Very slow video that only covers one or two simple concepts 3.5/5 Worth my time
Why didn't you just say 7/10
4:24 Do you have a measureing scale to put below the magnets? Does it's weight change while slowing down the aluminium plate?
Your videos are so neat 😮 Love your hobbies 😅
Excellent video as usual. Also I
I have absolutely never in teaching physics for about 15 years heard that it would be a "common misconception" that eddy currents would always cause repulsion. The idea that opposing (in Lenz's law sense) would get mixed up with physical repelling is something new to me. :S Is this a cultural, local or language thing? Has this misconception been studied in scied publications?
LoL!! The flame was like, "Go on!! Leave me alone......stop it ya big bully!! ". 😂
The rings look like they came out of HDD's. I have a couple of them myself 😊
I recognized that, haha
Well spotted, they are indeed :D Thanks for the early watch.
@@brainiac75 that got me to thinking, those should fall slower, then I realized the upper part of the ring is a lot farther from the magnet, and so the square law is raining on the parade. And THAT got me to wondering just how much the diameter of the cylinders is affecting the test. Someone in another comment asked about racing an aluminum cylinder of the same WEIGHT as the copper one, and that's what I was thinking... the larger diameter should lower the diamagnetic repulsion farther from the magnet? But I think at that point the math is getting very ugly and a plain test would be the fastest way to get an answer. Maybe if the LENGTH of the aluminum rod was made bigger without changing the diameter? But THAT got me wondering how things compare at different places on your crazy magnet. It's strongest in the middle right? So a long cylinder may not be fairly compared to a short one?
Physicist here. If one day I become a professor, I'll use your videos
Always a pleasure to watch your videos. Thank you. ;)
This is why I subscribed! LOVE IT!
Excellent video as always!!
Excellent video. I haven't seen any stainless steel soda cans but now I will pay attention. I've seen another video quite some time ago where the vlogger demonstrated the diamagnetic properties of a MOUSE - a real live one.
QUESTION... The last experiment, using the three samples are affected by the weight of the samples, although the copper and silver are similar in speed despite a weight difference. Could you try in a future video using the rare earth magnet on a pendulum between two blocks of silver/copper/aluminium to see the eddy current braking effect when the moving item is the same between them? The gravity effect is cancelled as the moving item is the same, but the density of the metals would be different (as well as the conductivity). GREAT VIDEO BY THE WAY!!!
Would also be good time to introduce the reason for laminated construction rather than monolithic solid blocks for some applications
Excellent vid. When rolling the cylinders, did anyone notice an increase in speed through the centre of the magnet, and only a slight decrease in speed on the trailing edge. (I'm thinking this was due to increased momentum through the centre)
Does electromagnetic induction occur when the can floats towards the stationary magnet creating almost like a feedback loop
Thought so. Excellent videos by the way.
Amazing video as always
Dang, i was just going off of conductivity and guessed silver.
Nice aspect that Aluminium was moving down slowest on the magnet. Not something that one would expect. Is this also true for an eddy current seprator?
I can't imagine being bored with you around, people in my life are very uninterested in interesting things like these. 😢
I would love to see someone make an eddy current slip-n-slide
Or an elevator, as a safety mechanism.
Nicely done 😎
Magnets are used to sort aluminum in recycling plants. The large motorized spinning magnets fling the aluminum off the conveyor belt.
Quite impressive and, in some ways, counterintuitive.
I was SO wrong about which one would be slowest. I thought copper would hold the title due to its ability to conduct electricity. Never guessed aluminium would be the winner. I also didn't know that silver was slightly more conductive than copper. Have you tried doing this with bismuth or some alloys?
where did you get those three cylinders from? also, were any of then coated to prevent tarnishing?
Thanks this experiments were awesome. I guessed it wrongly - didn't account the weight difference. Again what learned.
I had forgotten that silver was more conductive than copper. Silly me. Your big magnet seems to have magnetic bald spots or lacks uniformity. All 3 samples wiggles around the middle.
keep on the good work man i love your video's 😉
Silver is the most conductive to electricity and will have stronger eddy current effects in it when exposed to a powerful magnetic field. I wish it was used in home electrical wiring but unfortunately it's not as cheap as copper. I thought silver would be the slowest to roll of the neodymium magnet, odd
I thought the same, but I didn't take the relative weight of the aluminum vs the silver into account.
Should try the rolling experiment in a vacuum to see the effects of Eddy currents electrically discharging atmospherically.
love ur vids keep it up!
Eddy currents and the induced magnetic field are what spin the aluminum disk in analog electric consumption meters.
New video with the monster, Exciting!
Yep, they don't come that often ;) Thanks for the early watch, sulfie!
I kinda wonder a bit if the part of the aluminum moving so slow is also because it lighter than the copper and silver.
Awesome as always!
Every time I hear the word eddies all I can think of is this "'Eddies in the space-time continuum.' 'Ah...is he. Is he.' 'What?' 'Er, who is Eddy, then, exactly?”
would be interesting if you could make a mono pole generator since you have such huge magnets !
There are way too many people out there, that are completely oblivious to the fact that in addition to magnetic (ferromagnetic) and non-magnetic materials, there is also the existence of diamagnetic, and paramagnetic elements & compounds. There is a whole world of exciting things to explore, more than one person can ever experience in a lifetime. There is no time to waste!!
En ting jeg altid har tænkt på er: Hvor og hvordan i alverden opbevarer du dine store magneter? Fordi de helt store magneter må da kunne give problemer med andet elektronik eller lignende. Elsker at se dine videoer. Bliv ved med det :)
Kan du ikke engelsk?
@@ChiseledDiamond jo hvorfor da?
I nogle store kasser, så man ikke kan komme helt tæt på dem: kzhead.info/sun/rLFtiMlqmmJ4a4U/bejne.html Magnetfeltet aftager meget hurtigt med afstanden, så de er relativt harmløse på omkring halvanden meters afstand. Flere videoer på vej. Overvejer at lave en kasse med magnetisk skærmende mu-metal plader indbygget ;)
@@brainiac75 Spændende. Kunne ellers godt forstille mig at det havde været farligt hvis de ikke var pakke godt væk. Men det lyder også som en god ide med nogle kasser med magnetisk skærmning. :)
@@brainiac75 I've wondered if it's possible to build something like a Faraday cage but for magnets. I did some reading, and it does seem like you can use a metal box to "guide" the magnetic field lines, limiting how strong the magnetic fields are outside, but not to the same degree as a Faraday cage can with EM radiation. I don't have a solid grasp on the physics of it though, so I'd love to see any video you make about your experiments with storage boxes for your magnets!
Monster magnet were a great band but I've never heard of aluminium can!
Very Interesting... Some new info to store in my already crowded brain..
It's a pretty good video, but you could do another video on electromagnets, including one the scrap metal recycling industry uses to sort even lead. Covalence fields tuned to a particular frequency can attract specific metals, including gold. It's pretty nifty, mostly used in scrap yards to sort large quantities of different metals from each other. Also used when a steel mill is processing incoming metal bales to pull out the metals that can be attracted to them.
Similarly, I read before about an electromagnet called the master magnet that could attract any metal. It was simply an electromagnet with a copper disk attached to its face.
The magnet seems to have a sticky aura.
I have a question, is there such as thing as an electromagnet that can be purchased anywhere on the internet that can pickup aluminum, specifically an aluminum can? I know that some garbage dumps have special eddy current separators that cost tens of thousands of dollars, but I am looking for something that is small that is battery powered, or can be powered with 120 AC, or with an AC power supply that can pickup a can. Does anything like that exist? I already found electromagnets on the internet that are cheap, and they use AC instead of DC, but I have no idea if they work on aluminum. Maybe such things are not possible to create?
Very fun video, thank you!
Why should density affect the rolling speed? Both the gravitational acceleration and the rolling friction is independent of density. Could the difference be due to the surface texture?
while coper an silver produce stronger eddy currents, they have more mass working against those currents
@@krabkit ah.. ofcourse! That was simple. Basically the moment of inertia is larger for copper and silver. Thanks :)
You should try a ratio of the densities beginning with the inclined magnet angle for the slowest time to roll off, and multiply the ratio of one greater density to the lesser or least density and multiply that ratio of densities times the angle of the slowest time, tilt the magnet incline to that new angle and see if the densities roll off the incline in the same amount of time each.
I remember in high school physics when the teacher had an AC coil at the base of a 1m steel rod perpendicular to the demonstration table. When he placed an aluminum ring around the steel rod it fell and rested on the top of the coil. When the power was switched on the ring rose 15-20cm off the top of the coil and danced in the alternating field. And it got quite hot.
Really, reeeeaaally interesting Video! 👍😀
Was interesting to make too! Finally, I understand eddy currents 'opposing' nature :)
Great video, thank you. In the last experiment, gravity was mentioned a couple of times, but how does it affect it, by means of friction?
Well I think, the idea is to look at the forces on the cylinders. If you use a very basic model for the friction (lets say it is equal to the normal force to the surface times some constant) we could say the the accelerating force is sin(a)m*g (a being the angle of the magnet, m the mass of the cylinder) and the force due to friction is some friction constan b times the normal force = b * (m*g*cos(a)+ c*v). c being some constant for the specific material (due to conductivity, v being the speed at which it rolls down, rememberg that the current depend on the change of magnetiv field and only occur when it rolls). Alltogether we got something like F_total= sin(a)*m*g-b*(m*g*cos(a)+c*v). Now you can see that, if you divide by the mass to get the acceleration, the "negative" acceleration from the eddie current is proportional to c/m. With smaller mass it gets larger and with bigger conductivity it gets larger. Since the factor by which the aluminum is lighter then copper and silver is bigger than the factor by which its conductivity is smaller, you see what you see. Sorry if this is not very compact :D
Always amazing stuff from brainiac. Side note, I thought he was Japanese the first video I saw
Brilliant, thanks 😊
I appreciate the lengths you are going to to explain what is going on, using all manner of arrows and other symbols. I'm still having some trouble grasping it. Another viewing or two might do it. I think oxygen is paramagnetic, so we ought to be able to set up a device that uses magnetism to collect oxygen, right? Right? Hello? These quantum phones aren't very reliable ye [signal lost]
How about if you move the magnets close to elements to see if when in a pushing movement what it registers on the scale and when pulling away if it registers it’s getting lighter.
“MAGNETS!” -somebody on Breaking bad, I think.
Questions: Which one is better conductor in extreme weather as to much heat or cold?
This video was strangely relaxing... 😲
next video idea: buy DP-75 Rottengenmeter (working or dead and make other video repairing it) and make extreme test of it
Magnets are just fascinating... I never get tired of playing with them. I've spent countless hours trying to wrap my head around how they work. I'm convinced that whenever science can completely explain magnetism the worlds energy problems will be solved.
I'm guessing aluminum is the slowest despite being the worst conductor. Due mostly to it being significantly lighter.
Isn't there also a golden spot in internal resistance of the material, so aluminium is a bit worse conductor than tho other two, weighs less and that's helping it to roll slower?
Me: I'll never need to know any of this for real life Also me: Fascinating.
You might. Say you're designing something that is inside of strong magnetic fields, or being careful that your aluminium can doesn't melt into molten aluminum when it's near an inductor
noo! i was so sure it would be copper or silver, i didn't think about how light aluminum is. oh well! definitely will remember this the next time i hear someone say aluminum won't react to a magnet
Magnetism the easy way for us to create a literal tractor beam
I thought you where going to say "Click like if you will chuckle the next time you hear: Aaawwww" xD Awesome video!
Thanks so much for sharing. 😉👌🏻
How about taking the three different metals being with porosity like swiss cheese affect the magnetic roll on the magnet Sir ???
Could there be iron impurities in the aluminium causing the attraction?
I don't know what the deal is with Pepsi cans, but they have been using steel for 30+ years. We used to pick up cans to take to the recycler when I was a kid, and the conveyer belts at the recycling facility had strong magnets on them to attract and discard all the Pepsi cans. I think there were other brands, but everyone knew that Pepsi were no good for recycling (for aluminum prices anyway).
Is this how the effect of the ever going topspin in inception could maybe work?
Where do you get those big magnets, does anyone have a link or anything I want to get a couple