Defying Gravity - HUGE Neodymium Magnet vs Copper Tube Experiment - The Power of Lenz's Law!

In this video I will be making a 17.5 pound copper tube to experiment with Lenz's law.

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Introduction 0:00
Making the copper tube 0:51
Testing it out 5:08

[robinson-foundry]

If you're interested in any of the tools or equipment I use and you want to help support the channel then don't forget to check out some of the affiliate links in the video description. Thank you for the support!

[stillwater]

I cannot help but admire your shop. The beautiful Machinist Chest, the two beautiful wooden worktables, the sand blaster, the furnace, some of your equipment on the shelves, a really nice and very expensive shop to say the least. Thank you for making this wonderful video.

[theaquariancontrarian]

A furnace made out of a keg?!!! Brilliant!!!

[choppergirl]

8:30 Put the copper tube sideways on a rock tumbler, that keeps the tube rotating, so the big metal disc magnet floats in it suspended for as long as the rock tumbler keeps rotating the copper tube.

[jagrutbhatt]

Really appreciate your efforts, time and expense ..for this experiment.
Thanks👍👍

[pk]

Subliminalvibes is absolutely correct . In Electrical engineering courses, it is taught that magnetic circuits such as the one demonstrated in this video are analogous to simple dc circuits . In a simple dc circuit I = V/R where the current I in the circuit is equal to the dc voltage V in the circuit divided by the total resistance R . In the magnetic circuit the magnetomotive force mmf which is supplied by the powerful magnet is analogous to voltage in the dc circuit, the flux phi is analogous to current, and total reluctance R' is analogous to the resistance in the dc circuit . We then have the magnetic flux is phi = mmf/(R') . Now flux phi, and reluctance R' in this last equation are very important . Flux is a measure of the magnetic flux flowing through the entire magnetic circuit . The entire magnet circuit includes the magnet, the copper, and the air gap . By far the largest contributor to the total reluctance is the length of the air gap . This means that in phi = mmf/(R') we want the air gap as small as possible to make R' as small as possible to make the magnetic flux phi as large as possible . You could have stuck with the smaller diameter puck magnet, and a thin copper tube with a small clearance 1-2mm would be very dramatic .

[RT-qdyl]

Half the state of Florida wants to know your location right now on account of that chunk of copper...

[NeilCrouse]

3:34, ... I don't know why, but liquid metal has always fascinated me. It's like watching a campfire ... I get the same feeling of wonderment... *: )*

[dragoda]

Copper is really expansive. You invest a lot in this video. Well done!

[DanielBrown-nbzz]

This would have great application on car suspensions!

[randallrun]

Really? If this is the kind of weird stuff you do…..I’m totally IN!

[MadDragon]

That old turntable in the attic would be fun to use as a base to put the copper on. And a drill and some imagination for the neodymium. 😉👍 I would experiment with that stuff for months.

[AdamosDad]

Years ago, I worked for a company by the name of Thomas & Skinner, we made transformers and magnets, a large neodymium magnet was on a workbench, ready to be packed for local shipping, a tow motor came too close and got slammed by it, very funny to see and scared the driver to death.

[peterlindner]

Thank you for spending so much time and money to do these experiments. Pretty well exhausting the topic.

[TorstenHoff]

One of the coolest uses of eddy currents is in the braking systems for some roller coasters. They result in a fail-safe, unpowered, wear-free system that will quickly stop the cars as they approach the end of the ride.

[numberformat]

Reminds me of playing with exhibits at my local hall of science museum back in the day at the worlds fair grounds in Queens, NY.

[bradleycooper]

I like the weird tools in the background of your video

[WoodstockDz]

1:54 - "...a really durable ceramic mold."
3:59 - "...now I get to break it apart..."

[ecrusch]

Actually being able to SEE those forces at work is so much better.
Thank you for your hard work.
Eric in Kissimmee

[kumardigvijaymishra]

3:10 You could hold the crucible near the top rim with metal bar, and use that as a hinge while tilting crucible with another tool from the base. It might be better to hang the first tool with some rope from ceiling to bring it to a height suitable for pouring inside the mould.