Long time reader, first time poster :)
I'm a first year physics teacher in a high school, and I'm running a science fair where students research their own topics and create demonstrations. One group has chosen electric motors, and they are making a motor out of a battery, paperclips, coil of wire, and a neodymium magnet. They have shaved off the top half of the wire's insulation. However, once we put the coil in the paperclips and try to spin it, though, it spins just a few times before being attracted to the magnet.
I've done this project before for my degree, but for the life of me I can't figure out what's going on here. The wire is definitely conducting electricity (quite hot to the touch), and I've double and triple checked that only the top half of the wire touching the paperclips is sanded. We have also tried magnets of varying strength, all to no avail.
Thanks ahead of time for your time and help!!