Feynman discusses the “why” question, and why he can’t give a satisfactory explanation of magnetic attraction/repulsion.
When you explain a “why,” you have to be in some framework that you allow something to be true. Otherwise you are perpetually asking, “Why?”
I’ve pointed out before that science doesn’t really address the question of “why,” and this is the reason.
I really can’t do a good job, any job, of explaining magnetic force in terms of something else that you’re more familiar with, because I don’t understand it in terms of anything else you’re more familiar with.
In other words, you have to explain to the level of your audience.
Even some scientists don’t appreciate that science is not really about “why”; I once watched a physicist have a very heated discussion with his philosopher brother about this very topic. The philosopher argued that all observable physics is consistent with the hypothesis that an infinite number of invisible blue smurfs are running around making everything happen according to physical law, a view that irritated the heck out of the physicist. (And, yes, I see that an “invisible blue smurf” is an oxymoron.)