Wow... 2 years on and we're STILL discussing this? Why?

Well... therein lies your conundrum.... How can a very, very weak magnetic connection have any sort of martial use or application? Unless your opponent (or complicit student) is equally highly "sensitized" to such phenomena, I can't see how any of this would be practically useful martially or otherwise.

Personally, I think you're barking up the wrong tree... and draw your attention to The Feats of the Magnetic Girl Explained.