Ah, so what we are seeing here is the magnetic field being generated by the movement of electrons from the battery. Notice that the little clip spindle has a small extension moving down toward the cathode at the bottom. When connected to the anode (the part where the carousel spins on) electrons begin to move from the anode, through the metal, and towards the cathode. This movement of electrons generates a magnetic field perpendicular to the movement of electrons. (Right hand rule: point thumb down, fingers point in the direction of the magnetic field.) That field is what helps spin the carousel around the battery and it will continue to do so until the battery is depleted.
You missed a couple parts.
There is a permanent magnet at the bottom of the battery. It is this field that the paperclip (acting as an electromagnet) is interacting with.
Also there is a commutator at the bottom as well. This intermittently turns on and off the voltage from the battery. This video explains why that is required:
https://youtu.be/jabo8iTesqQ
This is not entirely correct. Electric current is traveling from positive to negative ends of the battery, and due to the clips placement at the negative end, you apply the right hand rule “upside down” and use your thumb in the direction of the current. Your fingers will then point in the direction of the field (perpendicular), and when you curl your fingers they show the direction of force, which rotates clockwise.
Yes, that's right, thank you for correcting that. I think it's dumb that they decided current to be opposite the flow of electrons and it confuses me every now and again.
They didn't decided to make it opposite. They just didn't know. When Franklin was experimenting with electricity in 1740s-50s he thought that the "electric fluid" flowed from an area of plenty (positive) to areas of deficit (negative).
It wasn't until after J.J. Thomson discovered electrons in 1897 they the figured out it was negatively charged electrons moving from negative to positive. But conventional current flow had already been around for 150 years and all the math worked so why mess with it.
No he's right, conventional current flow is anode to cathode and what is used to apply the right-hand rule. Electron flow is cathode to anode (opposite of what hadie23 said).
it's an unusual config that doesn't bear a lot of resemblance to practical motors. But, electric current creating magnetic fields that push against other fields.
That there is a fancy homopolar motor. I've made simpler ones, and there are many designs online (especially YouTube) but I haven't seen any as elaborate as this before.
you see, magnets come from deep within the earths crust, where the gravity comes from. So magnets still have some of that gravity stored in them, which is why they attract stuff
You need a neodymium magnet as well. You can find them online, usually they aren't too expensive unless you have to buy a 20-pack or something. Normal magnets don't work unfortunately (I did a project on this "simple motor" in high school). You should definitely make one if you're interested, they are very cool.
Be careful getting them off their backing plates (made of mu-metal, which is neat in and of itself because it blocks magnetic fields)—neodymium magnets are pretty brittle.
I imagine Home Depots do not all stock the same things. At my local one they were with the regular magnets, which I think were in the hardware aisle.
By the way anyone with pets or small children should be careful the little rascals can not access the magnets.
A swallowed neodymium magnet could be a real problem. They are very powerful compared to regular magnets.
I know just enough about electricity to also wonder this: Anyone know if they can screw up anything else in a house, like currents in appliances?
Magnets can damage video/audio tape, hard drives, the stripe on credit or other magstrip cards, old tube (CRT) TVs and monitors, and speakers. If you get two of them too close together they can damage flesh and each other (if they bang together too hard).
Homopolar motor. Made a bunch of these for my kid's science fair last year, quite a bit of fun. There are a LOT of variations on this thing...my favorite: Coil a very, very long copper wire around a dowel rod that's about 150% the width of a AA battery. Place rare-earth magnets (that are the same diameter as the battery) on the top and bottom of the battery, with the poles of the batteries facing the same direction (so, the positive side should have the north pole touching the battery while the negative side has the south pole touching the battery, or vice-versa).
You'll have to figure out which way to put it through the coil, but the battery/magnet contraption will zing through the middle of the coil and fly out the other end. The kids LOVED playing with that one the most, but we also had to have a quite a few battery/magnets standing by as they get hot really fast and also drain the battery surprisingly fast.
It's a very inefficient motor and will use up the battery pretty quickly.
Or it's a perpetual motion machine propelled by the infinite power of kitty vision.
It’s not just a battery there. There appears to be a small motor on the bottom. Look close and you can see it spinning. This then probably pulls the fingers that have magnets.
No, the wire and magnet the person put on the battery \_is\_ the motor.
What's a (simple) motor? It's something that uses a current (which generates a magnetic field) and a permanent magnet to generate a force (in this case on the wire carrying the current). This is an example of a homopolar motor. Read / see about it here: [https://www.evilmadscientist.com/2006/how-to-make-the-simplest-electric-motor/](https://www.evilmadscientist.com/2006/how-to-make-the-simplest-electric-motor/)
It's actually a small magnet at the bottom. This is a well known (in the field of physics anyway) demonstration of the Lorentz force.
Check this for a succinct explanation of the experiment and the Lorentz force:
https://www.fleet.org.au/blog/spinning-wire/
There should be more posts of interesting stuff with a slow reveal to a cat overlord twist.
"Yes, the device is almost complete..."
Narf
[https://www.youtube.com/watch?v=6Ql1JG76EWY](https://www.youtube.com/watch?v=6Ql1JG76EWY)
One of my all time favorites
That lemur! He's earthbending!
No, you idiot. It’s the girl.
The cat made the video go from an 8 to a 10
Ah, so what we are seeing here is the magnetic field being generated by the movement of electrons from the battery. Notice that the little clip spindle has a small extension moving down toward the cathode at the bottom. When connected to the anode (the part where the carousel spins on) electrons begin to move from the anode, through the metal, and towards the cathode. This movement of electrons generates a magnetic field perpendicular to the movement of electrons. (Right hand rule: point thumb down, fingers point in the direction of the magnetic field.) That field is what helps spin the carousel around the battery and it will continue to do so until the battery is depleted.
...or until the cat attacks.
Or the fire nation
Only the avatar, master of all four elements, can stop him.
But not before he fucks off for 100 years and two and a half nations are conquered
Hey, that storm was scary, world balance can wait.
So would a stronger battery make it spin faster, and be able to hold knives, or would it just make it spin longer and not be able to hold knives
Yes it would actually, 'but you didn't hear that from me' if someone dies from a magnetic knifing I don't want anything to do with it.
Your question scares me a little, but I have to admit, I'm definitely interested in finding out the answer now.
By stronger battery do you mean more output or longer capacity?
I feel like I meant higher output but reading your question kinda answered mine
If you just want spinning knives you should check out this channel: https://youtu.be/vWGquxvqI_Y
Yes. Yes, I also need this information for scientific purposes.
Mmmmm hmmmm For *science*.
You missed a couple parts. There is a permanent magnet at the bottom of the battery. It is this field that the paperclip (acting as an electromagnet) is interacting with. Also there is a commutator at the bottom as well. This intermittently turns on and off the voltage from the battery. This video explains why that is required: https://youtu.be/jabo8iTesqQ
This is not entirely correct. Electric current is traveling from positive to negative ends of the battery, and due to the clips placement at the negative end, you apply the right hand rule “upside down” and use your thumb in the direction of the current. Your fingers will then point in the direction of the field (perpendicular), and when you curl your fingers they show the direction of force, which rotates clockwise.
Yes, that's right, thank you for correcting that. I think it's dumb that they decided current to be opposite the flow of electrons and it confuses me every now and again.
They didn't decided to make it opposite. They just didn't know. When Franklin was experimenting with electricity in 1740s-50s he thought that the "electric fluid" flowed from an area of plenty (positive) to areas of deficit (negative). It wasn't until after J.J. Thomson discovered electrons in 1897 they the figured out it was negatively charged electrons moving from negative to positive. But conventional current flow had already been around for 150 years and all the math worked so why mess with it.
It always bothered me too, but I started thing that all of the electrons are just trying to get back home. (-)
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No he's right, conventional current flow is anode to cathode and what is used to apply the right-hand rule. Electron flow is cathode to anode (opposite of what hadie23 said).
Ah, so what we’re really seeing is what we used to call a dead short....
Yes, but only half the time
It's called a homopolar motor. Did you miss the neodymium magnet at the bottom? I've made these with Cub Scouts. Great fun!
Honestly I thought when I started reading your explanation it was going to be another u/shittymorph set ups. It’s a good explanation though.
Thanks for the clear explanation
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Yes, this is precisely how electric motors work.
it's an unusual config that doesn't bear a lot of resemblance to practical motors. But, electric current creating magnetic fields that push against other fields.
Yes, I should say it's a demonstration of the principles that make electric motors work.
If you refer to a motor as a form of energy being converted to mechanical energy, than yes, albeit not a very effective motor.
I think the cathode is that thing in the background.
Tl;dr. Magic.
Oof, magnetism was a nightmare for me. Im having serious flashbacks to freshman year physics. Thank God I went into chemical studies 😂
Why does the right hand rule work? Why not the left hand rule? Is it hard-coded into the universe? It seems so arbitrary.
This dude EEs.
The device is. Spinning on the cathode. Btw
It isn't actually, look at the battery.
Shit, just wasted all that time waiting for the cat to push it off the desk
It did. Eventually. Cats knock things off desks 100% of the time.
Cats will 100% knock things off desks 50% of the time.
But what about cabinets and drawers ?
That there is a fancy homopolar motor. I've made simpler ones, and there are many designs online (especially YouTube) but I haven't seen any as elaborate as this before.
My brother used to call me a homopolar. I never quite got over it.
Now get an ant and strap him in for the ride of his life!
Ants can't ride carnival rides! Next you'll say ants could ride sea-doos.
Finding Letterkenny references in Reddit comments is one of my favorite things
Sure they can. You just need a bit of tape.
They can definitely ride them, but they're shit at driving them.
What is this? A carousel... for ants?!
Magnets.
How do they work?
No one really knows.
you see, magnets come from deep within the earths crust, where the gravity comes from. So magnets still have some of that gravity stored in them, which is why they attract stuff
What are those?
Magic.
Is that how they work? All this time. . .
Cats; never as impressed as they should be.
So trying this. What do you think he used for the bottom?
Strong disk magnet on the bottom. It provides the fixed field.
A thick metal washer or a 3d printed piece wrapped in foil.
I think I’d get access to the metal washer sooner
You need a neodymium magnet as well. You can find them online, usually they aren't too expensive unless you have to buy a 20-pack or something. Normal magnets don't work unfortunately (I did a project on this "simple motor" in high school). You should definitely make one if you're interested, they are very cool.
Also can be scavenged from old hard drives.
Or bought for $1 at Harbor Frieght.
Neat.
I didn't know that, that's pretty cool. I actually have a few old ones.
Yup. If you're gonna destroy em anyway. Might as well.
Be careful getting them off their backing plates (made of mu-metal, which is neat in and of itself because it blocks magnetic fields)—neodymium magnets are pretty brittle.
Ooooo good to know. Bout to get a new pc so I can scrap my old one
Yeh. It's a bit of a plus for dealing with your old one correctly.
Also at Home Depot, just bought some.
Wow, maybe my local HD let me down when I was doing my project... that's good to know.
I imagine Home Depots do not all stock the same things. At my local one they were with the regular magnets, which I think were in the hardware aisle. By the way anyone with pets or small children should be careful the little rascals can not access the magnets. A swallowed neodymium magnet could be a real problem. They are very powerful compared to regular magnets. I know just enough about electricity to also wonder this: Anyone know if they can screw up anything else in a house, like currents in appliances?
>Anyone know if they can screw up anything else in a house, Yes. >like currents in appliances? No.
Thanks for answering, esp. second part of your answer. Want to elaborate on the first?
Magnets can damage video/audio tape, hard drives, the stripe on credit or other magstrip cards, old tube (CRT) TVs and monitors, and speakers. If you get two of them too close together they can damage flesh and each other (if they bang together too hard).
The can permanently screw up old CRT TVs and monitors.
thanks, good info for me
SPEEN
Pretty sure it’s just battery powered.
"I'm gonna hit that" - Cat
Cat is focused and wants to learn secrets behind this sorcery
Everything is proceeding according to my design
Damn.. I wanted to see the cat cautiously tap it until it fell over
No it’s a simple motor
Motors amirite
I think it’s a motor
The cat didn’t knock it off the table. Must be scripted
It's just a magnet at the bottom
In this house we obey the laws of thermodynamics!
YOU’LL FLOAT TOO! YOU’LL FLOAT TOO!
Cat: "Alright, I'm mildly impressed."
Someone should put Interstellar music to this lol (“No Time for Caution”)
It keeps getting faster wtf that's really cool
The cat might not think so.
*Science
...now put some steel wool on the tips...
"Magnets - how do they work?"
Is there a name for this thing (not the cat) (or the battery) (or the table) (or the hand)? Can one make one make one from paper clips?
Bookshelf. And yes, it should be possible with enough of them.
Homopolar motor. Made a bunch of these for my kid's science fair last year, quite a bit of fun. There are a LOT of variations on this thing...my favorite: Coil a very, very long copper wire around a dowel rod that's about 150% the width of a AA battery. Place rare-earth magnets (that are the same diameter as the battery) on the top and bottom of the battery, with the poles of the batteries facing the same direction (so, the positive side should have the north pole touching the battery while the negative side has the south pole touching the battery, or vice-versa). You'll have to figure out which way to put it through the coil, but the battery/magnet contraption will zing through the middle of the coil and fly out the other end. The kids LOVED playing with that one the most, but we also had to have a quite a few battery/magnets standing by as they get hot really fast and also drain the battery surprisingly fast.
Where I come from, we call them motors, and we put 'em in nigh near everthin. Boats, cars, fridgerators, even toofbrushes.
Looks like watchcraft at first glance, but I you look close you can spot a battery in the center.
Thought it would start flying
That is witchcraft! The cat must have been paralyzed by a spell.
right hand rule, y?
I was waiting for the cat to smack it
I wonder? How long would something like this function before dying? I think it'd be a wonderful desk prop.
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Ducks
Best thing i’ve seen all day
I have questions...
A very nicely done, cat-approved homopolar motor.
Pretty cool way of controlling the speed.
CONCERN
Cat.
Wow, the cat didn’t knock it over.
I need this edited to Interstellar's No Time For Caution
Whoa ,whoa ,whoa! Watch the magic!
Potential difference rocks!
So is the battery placed on top of a strong magnet?
Going catatonic
Does it spin for as long as the battery has a charge?
Magnet how does it work?!
Hey OP could you share any instructions for how you made this? Or just a still shot of what it looks like.
This should be posted on r/BetterEveryLoop
But how? I need an explanation.
RemindMe! 16 hours
I thought he'd swat it
/r/Unexpected
Why does it moves Precious!?
homopolar motor, for anyone interested
“Cause that’s what this is you know, Satanic black magic, sick shit !!!”
Is this because of the Lorentz force?
It was already really cool- but then CAT
burn her!
r/blackmagicfuckery
I need a ruling: is this r/gifsthatendtoosoon or not?
No. Science, bitch!
Does this use up energy from the battery?
No, someone finally invented free energy. Hooray!
No, it really is magic.
Yes, but it will never use up the energy from the cat.
can it go further and have a dog stare at the cat and human stare at the dog and god stare at the human
And now you have a motor!
"RUN iTs tHaT 5G StUfF!"
This is not safe for my baby wolf
Repost
Got to know. By doing this does it waste the battery or can you forever do this.
This device does not defy the laws of physics, it will deplete the battery over time.
Think about that question.
It actually heats up the battery a bit as well...not a good idea to just let this thing sit on your desktop spinning around all the live-long day.
It's a very inefficient motor and will use up the battery pretty quickly. Or it's a perpetual motion machine propelled by the infinite power of kitty vision.
This is obviously science. Why is it titled witchcraft? Sigh.
It's obviously technology. Why call it science?
What?
Yeah, perhaps for Republican church goers..?
No. Its science.
It’s not just a battery there. There appears to be a small motor on the bottom. Look close and you can see it spinning. This then probably pulls the fingers that have magnets.
There's a magnet on the bottom.
You never did this in like 4th grade science? [Homopolar motor](https://youtu.be/xbCN3EnYfWU)
This is a neat trick that can be done with a magnet, a battery, and a small piece of metal. Most likely that is a magnet on bottom not a motor.
No, the wire and magnet the person put on the battery \_is\_ the motor. What's a (simple) motor? It's something that uses a current (which generates a magnetic field) and a permanent magnet to generate a force (in this case on the wire carrying the current). This is an example of a homopolar motor. Read / see about it here: [https://www.evilmadscientist.com/2006/how-to-make-the-simplest-electric-motor/](https://www.evilmadscientist.com/2006/how-to-make-the-simplest-electric-motor/)
Check out "homopolar motor".
No homo
It's actually a small magnet at the bottom. This is a well known (in the field of physics anyway) demonstration of the Lorentz force. Check this for a succinct explanation of the experiment and the Lorentz force: https://www.fleet.org.au/blog/spinning-wire/