For awhile, I got to work at Hopkins with two of the guys who invented the MRI. What a priveledge. Bill Epstein and Paul Bottomly.
At the time, 1.5 T magnets were becoming common. In the basement, they had an experimental 5T magnet. Even with Faraday cage, outside in the hallway you could feel the magnet’s pull.
You don’t want to go near these things with any kind of iron based metal on you, or in you. The closer you get, the stronger the pull. People would forget to remove their wallets, and it would erase credit cards.
Those guys were genious from another planet. And really, really nice guys.
Lol! I was just about to ask about credit cards.