@utubesqueeze No. The aluminum is not a superconductor. There is no Meissner effect here. This is merely Lenz's law demonstrated with an extremely powerful magnet.
Magnetism is so bizarre but because we're exposed to it as little children we're totally unimpressed by it as adults.
I mean just look at that video, the piece of metal is floating around in the air like it's no big deal because it is near the other piece of metal and that's just what magnets do... What is this, The Lord of the Rings? It's goddamn sorcery I tell you.
@Pudersepp Why? Explain please. I would think that the vector cross product v x B (Lorentz force) is always in the same direction when you throw the tube from the front towards the back (B is vertical), so that in order to have a centripetal force for circular motion it could only fly clockwise.
If you consider a particle, then yes, you are right, it would fly out. I was a bit rush when posting that last post. But I am not totally sure yet, I'll work it out. The aluminum tube is not a point particle. This has something to do with eddy currents, but that in turn needs a net flux trough the surface. Here the net flux would be zero if the field is vertical. A bit puzzled I am.
@Pudersepp I would think when the tube moves, the Lorentz force redistributes the electrons in the metal grid (Eddy current) until the tube reaches a polarized state. Then the left-right charge distribution in the tube creates a net Lorentz force perpendicular to the velocity and the magnetic field.
Perpendicular to the magnetic field? You mean the field is horizontal? I don't think polarization really explains this, because it describes a static equilibrium sort of (like Hall effect). The most important part here is knowing the direction of the B field. If it is vertical, then there is no flux trough the tube and no current. What happens if you imagine the foil to be a solenoid with a field trough it? Then the force would be directed downwards in the vector product?
@Pudersepp The field is vertical in this magnet. So there really is no flux change as the cylinder moves. Maybe it's a fringe field effect as well, with the field lines bulging out at the edges of the magnet. I do believe that polarization will take place, like in a Faraday wheel: when a solid disk spins in a magnet field with B perpendicular to the surface of the wheel, there is no flux change, yet there will be a voltage drop between the disk's center and edge, which can even drive a current.
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brilliant video some very interesting points
osclarkos 3 weeks ago
fucking magnets.... how do they work?
ssal1122 4 weeks ago
This is a great video
alexasmithy 1 month ago
Is this example of "quantum levitation", i.e. magnetic flux trapping?
utubesqueeze 3 months ago
@utubesqueeze No. The aluminum is not a superconductor. There is no Meissner effect here. This is merely Lenz's law demonstrated with an extremely powerful magnet.
10mintwo 2 months ago
Magnetism is so bizarre but because we're exposed to it as little children we're totally unimpressed by it as adults.
I mean just look at that video, the piece of metal is floating around in the air like it's no big deal because it is near the other piece of metal and that's just what magnets do... What is this, The Lord of the Rings? It's goddamn sorcery I tell you.
reluctable 4 months ago
Its a verticle (high ) field open MRI with 1T Tesla strength. Actually near the bottom it is close to 3T but they don't mention that ;)
submitor 5 months ago
That guy is totally high
feikken 6 months ago
indeed the 1 Tesla open magnet from Philips.
It is superconductive (cooled with liquid helium)
The magnet field points upwards (north pole at the top)
MrGastonBates 6 months ago
It is Panorama HFO from Philips
blower05 6 months ago
I would like to know the magnet pole direction and whether it is a permanent magnet or a electromagnet?
blower05 6 months ago
Thats a pretty expensive toy...
jimmyPain2121 7 months ago
Kas, we are waiting next clips:))
ugur
ugurlama06 10 months ago
I've got a few more, but they still need to be processed ...
MrGastonBates 6 months ago
hey is their any way to turn a mri machine off ?
thejoshinator08 1 year ago
@thejoshinator08 it works with electricity...
bestplugins 1 year ago
@thejoshinator08 yes its called a quench of the magnet and is costly
alin0steglinski0 1 year ago
sure: connect the power supply and reduce the current to zero amps
or press the emergency button (the magnet quenches and looses the expensive helium)
MrGastonBates 6 months ago
Eddie currants.
MaXG65 1 year ago
I was traveling in China and they have blocked the connections to YouTube in all the hotels, so I could not reply earlier.
But: No it will also circle. Next week I'll record a better quality video and update this one
MrGastonBates 2 years ago 3
I bet if you would throw it in the opposite direction, it would fly out of the machine, right?
pegheadproductions 2 years ago
@pegheadproductions
No, it would do the same.
Pudersepp 1 year ago
@Pudersepp Why? Explain please. I would think that the vector cross product v x B (Lorentz force) is always in the same direction when you throw the tube from the front towards the back (B is vertical), so that in order to have a centripetal force for circular motion it could only fly clockwise.
pegheadproductions 1 year ago
@pegheadproductions
If you consider a particle, then yes, you are right, it would fly out. I was a bit rush when posting that last post. But I am not totally sure yet, I'll work it out. The aluminum tube is not a point particle. This has something to do with eddy currents, but that in turn needs a net flux trough the surface. Here the net flux would be zero if the field is vertical. A bit puzzled I am.
Pudersepp 1 year ago
@Pudersepp I would think when the tube moves, the Lorentz force redistributes the electrons in the metal grid (Eddy current) until the tube reaches a polarized state. Then the left-right charge distribution in the tube creates a net Lorentz force perpendicular to the velocity and the magnetic field.
pegheadproductions 1 year ago
@pegheadproductions
Perpendicular to the magnetic field? You mean the field is horizontal? I don't think polarization really explains this, because it describes a static equilibrium sort of (like Hall effect). The most important part here is knowing the direction of the B field. If it is vertical, then there is no flux trough the tube and no current. What happens if you imagine the foil to be a solenoid with a field trough it? Then the force would be directed downwards in the vector product?
Pudersepp 1 year ago
@Pudersepp The field is vertical in this magnet. So there really is no flux change as the cylinder moves. Maybe it's a fringe field effect as well, with the field lines bulging out at the edges of the magnet. I do believe that polarization will take place, like in a Faraday wheel: when a solid disk spins in a magnet field with B perpendicular to the surface of the wheel, there is no flux change, yet there will be a voltage drop between the disk's center and edge, which can even drive a current.
pegheadproductions 1 year ago