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Yes, the flake stands up when they approach a neodymium magnet to it -- but the corner that stands up is different! Isn't that consistent with a regular magneti
by david-gpu 3y ago
Yes, the flake stands up when they approach a neodymium magnet to it -- but the corner that stands up is different! Isn't that consistent with a regular magnetic object, rather than a superconductor?
Look carefully at this video [0].
Which corner stands up around 2:05 ~ 2:10? The levitating corner falls towards the left side of the screen. Notice the color pattern.
Then the researcher flips the Neodymium magnet underneath. The idea being that if the flake was superconducting, the same corner of the flake would levitate.
Tell me, which corner stands up at 2:26 ~ 2:30, after the magnet was flipped? Is it the leftmost corner as before? No. It's the one at the bottom of the screen now. You can look at the color pattern and notice that it's truly a different corner, not caused by a spurious rotation of the flake while we were not looking.
In conclusion, in this experiment the flake behaves like every other regular magnet I've ever seen.
Disclaimer: not a physicist of any sort, but I have a pair of eyeballs.
[0] https://targum.video/v/2023/8/1/2534a4408ccce9c13a811e94f16d1543/ https://targum.video/v/2023/8/1/2534a4408ccce9c13a811e94f16d...
- m3kw9 3y agoThat’s not how magnets behave because you missed the part where he switches polarity and it still stands up
- david-gpu 3y ago> That’s not how magnets behave because you missed the part where he switches polarity and it still stands up But a different corner stands up. How do you explain that? The way it looks to me, the leftmost corner of the flake has one pole of the magnet, and the bottom-most corner has a different pole. That's why different corners float when the magnet is reversed. Like I said, I'm no physicist, but this looks like every other magnet I played with as a child. Please help me understand how this is any different.
- m3kw9 3y agoA normal wouldn’t stand up like that with both polarity exposed to it. Try it with your toy set.
- david-gpu 3y agoWhy would it not? If you bring the North pole of a big magnet, I would expect the South pole of the flake to be attracted to it, and the North pole to be repelled. When you flip the big magnet around and bring the South pole this time, I would expect the opposite. Isn't that what we are seeing in the video? I would happily do it at home if I had magnets around, but I don't. Sorry.
- cthalupa 3y ago>Isn't that what we are seeing in the video? No. All of these videos show the same part of the flake being repelled by both sides of the magnet, as well as other videos showing that the sample does not attract.
- david-gpu 3y ago> All of these videos show the same part of the flake being repelled by both sides of the magnet I'm afraid we are not seeing the same, then. In this [0] video I can clearly see a different corner of the flake being repelled at 2:07 ~ 2:13 versus 2:27 ~ 2:30. However, I agree that the other videos people like you have posted on this thread show materials that are not ferromagnetic. [0] https://targum.video/v/2023/8/1/2534a4408ccce9c13a811e94f16d1543/ https://targum.video/v/2023/8/1/2534a4408ccce9c13a811e94f16d...
- cthalupa 3y agoThat does not disprove my statement. As I noted in my more in-depth breakdown, compare 1:55 vs. 3:03 - you will see the same corner being lifted despite opposite sides of the magnet being used to lift it.
- cthalupa 3y agoAt 1:55, we see a drop from the first side of the magnet. As we see it fall, we can tell that it is the rightmost corner that was standing. Take a look at the top edge - the two sequential dips. The bottom edge is a smooth-ish long curve that protrudes out to a bulb on the leftmost corner. Now let's go to 3:03 and do the same. Once again it is the rightmost corner that was standing, the same as before, even thought the magnet has been flipped, and the right edge has those two sequential dips, and the left edge has the smooth-ish long curve. However, let's go back to 2:05, and the original magnet position. We see it stand and fall, but we can tell that it was the leftmost corner this time, the one that has the long curve that ends in a protruding bulb - we had different corners in the standing position with the same orientation on the magnet, and the same corner set in the same standing position with the flipped orientation on the magnet. I don't fully understand why the same magnet orientation could result in different corners being stood up (though I would guess it is related to the object likely being diamagnetic), but the same corner standing up even when the magnet is flipped rules out a regular ferromagnetism, from my limited understanding.
- ChrisClark 3y agoHere's a different video where the same side lifts up for both poles of a magnet. The corner that stays down is the same the whole time. https://www.bilibili.com/video/BV1Ex4y1X7ix https://www.bilibili.com/video/BV1Ex4y1X7ix
- daneel_w 3y agoThis video shows the flake standing up in the same orientation (on its pointiest tip) for both applied polarities of the magnet: https://www.bilibili.com/video/BV1Ex4y1X7ix/ https://www.bilibili.com/video/BV1Ex4y1X7ix/
- david-gpu 3y agoThanks for sharing this new video -- having both the magnet and the magnified view in frame continuously makes it much more clear.
- deleted 3y ago[deleted]