Electromagnet in Liquid Nitrogen
https://www.youtube.com/watch?v=YledrMyoqgs
Electromagnet With Supermagnet Core
https://www.youtube.com/watch?v=XM6CZIBMMg0
https://www.youtube.com/watch?v=YledrMyoqgs
Electromagnet With Supermagnet Core
https://www.youtube.com/watch?v=XM6CZIBMMg0