Posted by: Hubbell to Sciences » AP Physics » Videos » Magnetism
Cool video demonstrating magnetic induction.
Score: 50Elena Escalas says: Well...that was mesmerizing! Pretty cool how so much "polarization" (term used loosely because not quite 100% with this whole electrostatics thing yet) / net charge on the silver object had such a repulsive force with the copper cylinder that it could move it around so much and in some cases defy gravity. It looks like something that would be very fun to play around with, although it did kind of scare me when the things almost dropped a couple of times.
Alden Neely says: This is pretty cool. I'm a big fan of the dreamwave breakbeat playing in the background. Honestly, I have no idea how this works. I feel like the magnet should just orient in one direction, and then just fall. I'm not sure why it spins in a circle, it seems counterintuitive.
Maurice Chiang says: Definitely a cool part of YouTube. I find it interesting that he spins the magnet as he places the object through the cylinder, and that the magnet experiences a net fraction of gravity (it travels slower). I am trying to image the changes in charge and polarization as the magnet spins in the thick copper cylinder. I wonder if this same principle is used in trains (e.g. MagLev) or other commercial vehicles for dampening.
Josh Huang says: I really liked the chill music in the background! And the demonstration was cool too. I'm actually really excited to learn more about electrostatics: it seems daunting and difficult but its also really interesting. I don't exactly know what's going on with the copper pipe and the magnet but hopefully we will learn about that soon.
Josh Huang says: I just realized that the beginning of my comment is pretty much the exact same thing as what Alden said and I didn't even read his...
Michael Becker says: We haven't learned about magnetism yet, but this video is just sick. It's awesome how the spinning magnet seemingly defies gravity as it descends through the magnetic field caused by the copper pipe. I wonder if this can be recreated on a smaller scale; getting a copper pipe and magnet of these sizes seems tough, but it's cool to see the power that magnetic forces have, it holds up the seemingly heavy magnet against gravity.
Mitchell Coverstone says: This is super crazy. I humbly request we do this in class. This is something that i do not understand yet since I don't know much about magnetism. The ring around the magnet seems to somehow put a force on the magnet in the center outwards causing the net force to be somewhat less straight down than it would be with just mg down in free fall. I apologize if this is a horrendous explanation for this example but it is the best i can do with the tool belt I've acquired so far in AP Physics.