Hi, here is a couple of questions about superconductors Each superconducting material has a rating for critical field intensity. Now, does the field generated by its own current count? And also what is the current superconducting (type II) material with highest current densities achieved? And third question. If you have a superconducting material with an already initiated current, and you put some kind of a load on top of it (to levitate), would there be a counter-effect on the current inside the superconductor, meaning, would the current slow down due to the force between the two objects.