Even a hypothetical superduperconductor (flexible like copper wire, infinite current capacity, zero resistance, easy to splice, works up to 200 degrees C, smell

Even a hypothetical superduperconductor (flexible like copper wire, infinite current capacity, zero resistance, easy to splice, works up to 200 degrees C, smells like flowers, costs nothing, etc) wouldn’t make all this magic happen. Magnetic fields store energy, and a failure in an electromagnet (even a superduperconducting one) will dissipate that energy quickly (limited only by how high the kickback voltage can get before non-superconducting parts, arcing, etc carry the current). Also, an electric current (even a superduperconducting one) experiences a force inside a magnetic field — a lot of the material of a high-field magnet is the structure needed to keep the magnet from flying apart under its own Lorentz forces. Also, that MRI machine would appreciate a uniform magnetic field, and everything else in the room would appreciate a rapid fall-off outside the machine, and a hula hoop won’t achieve either one.