Where are the boundaries though? Are they established?
There must be a point at which a magnet of power n causes a negative effect that increases along with n, time, and exponentially with proximity?
There must be a point at which a magnet of power n causes a negative effect that increases along with n, time, and exponentially with proximity?
(Seriously though, there are research magnets powerful enough to levitate plastic that people have jammed their hands into with no ill effects. It seems that across a wide range of intensities at least, the human body just does not care. This is, perhaps, surprising given how much electrochemical activity is necessary for continued homeostasis, but it appears to be observationally true).
[1] https://www.ru.nl/hfml/research/levitation/diamagnetic-levit...
Deserves its own post.
Working in certain environments (IIRC >2T) requires special training, that include things like "slow walking", since moving too fast would induce currents in the brain that could knock you out.
For a product that I worked in we had to find a cheap way to create a 2T static field for validation, the complications of each of the possibilities were amazing.
In a brief search, I found this strange and interesting article from 1983, regarding experiments conducted at Lawrence Berkeley Laboratory of the University of California:
https://www.nytimes.com/1983/02/22/science/do-enormous-magne...
TL;DR - there were detectable effects on heart function, eye function and possibly sense of direction. The effects were deemed safe at the levels studied.
Here is the study the article appears to be about (on page 86, as numbered in the scan):
https://inis.iaea.org/collection/NCLCollectionStore/_Public/...
Going by its closing remarks, it appears this was an active field of research at the time.