Well, cutting a single core in 2 will do what you say, but you will have to insulate it somehow. The air will remove the heat pretty fast. And if you get air movement it will naturally remove the heat even faster. So getting it set up so that the air is contained and insulated may be kind of a problem. I was thinking more along the lines of 2 pieces of ferromagnetic metal, iron and something else. I'm not sure what the something else should be, but whatever it is it should be easy to find. Looking at a list of ferromagnetic materials nickel may be the most common one available. I don't think we would want to start with something that is already magnetized.

Bill Gill

C is not the speed of light in a vacuum.
C is the universal speed limit.