Inside MRI machine sound, Superconducting magnets 1500Amp
MRI that is not in superconductive state(magnetic field off),
Inside are 2 Tons of Liquid Helium
Temperature 4,2kelvin
380Amp Magnets
The sound is coming from Helium pomp that need to work non stop.
If the power goes of the helium start to evaporate.
1 Tesla Magnetic Field.