Don’t know about the hovering coin but if they all create a negative magnetic field I can see it being plausible, can’t say I have my head around that one though. However the batteries and the coil (not just a tube) is just how you make a magnet from a battery at all. So the metal on the end of...

Spoon one is a camera trick, someone spun a coin then picked up a battery, then they played the video in reverse.