Eddy Current Tubes

As you drop neodymium magnets down these large diameter, thick-walled copper and aluminum tubes, you can watch them twist and turn as they slowly fall. A moving magnetic field creates a surprisingly strong opposing magnetic field in these tubular conductors. The length of the heavy-walled aluminum tube is calculated so that magnets take the same time to fall as the shorter copper tube. Available from Educational Innovations at www.teachersource.com

Category:

Education

Tags:

• science
• lenz's law
• education
• physics
• magnetic fields
• magnetism

[laynecaffy]

2+2=5

[easystuph]

@sailingsolar Yeah but the magnetic field produces by the current has polarity opposite to that induced it.

LENZ'S LAW ;]

[rajasekhar456]

What is that film you used to make visible magnet which is moving inside tube....????

[darthspeaks]

If you had a pipe of differing lengths and they drop at the same time then the resistance of the magnetic field is more connected to gravity than the electromagnetic field is to the magnet. Interesting!

Reminds me of the feather falling the same time as the rock in a vacuum.

[regretsmyl]

magnetic film viewer was very clever idea. Looks like x rays  ;)

[MiNigle]

Lift/elevator shafts should have this ability as standard

[sailingsolar]

As we all should know, when a magnetic field passes through an inductor it will generate current. That current produces a magnetic field. That magnetic field is what is slowing down the fall of the magnet.

Another way to understand this is to think about the resistance you feel when you turn the shaft of a generator under load. That resistance to your truning the shaft is the some resistance the falling magnet is feeling as it falls, thus slowing it. SS

[KingDaChriss]

awesome