I recently came across this paper detailing a plan to use 12 superconducting rings around earth to strengthen our magnetic field. I'm planning on using this same idea for my own worldbuilding.
An advanced civilization is terraforming an Earth sized planet that has no natural magnetosphere. They use 12 superconducting rings to create an artificial one. The NIFS paper I linked to gives me a lot of good information that I need to use this idea, but one part of the paper, on page 10, in particular confused me. It says:
The finite magnetic field generated by a 6.4 MA superconducting ring would necessitate a 2.6 km safety zone adjacent to the cable to assure that the public exposure limit of 5 G is not exceeded.
I'm no physicist, but from what I've gathered G stands for gravitational constant. If I'm not interpreting that incorrectly, then my question is what is the relationship between powerful magnet fields and gravitational constant, and why is there a public exposure limit of 5 G?
Or, more concisely, what effects would a powerful superconducting ring have on a nearby human?