Can you solve the MAGNET RIDDLE? ft YouTube CEO Susan Wojcicki

With the file -- file some shavings off of both of the bars and see which bar does not magnetically attract its own shavings.   With a string, cut the string in two and suspend both bars horizontally (far enough apart to avoid magnetic field overlaps) and see if one consistently settles into a single orientation vs the more more random rest position of the other bar.    If the bars are thin enough to be bent, see if you can can get the ends of one bar to repel each other.  If there is anything with a CRT or LCD or Plasma in the room that you don't particularly care for, see if you can muck up the display my holding either bar up close.     But I think the first thing I would try is simply playing with where I have the bars contact each other;   I would guess that if the poles are indeed on the ends of the magnetic bar, any part of the nonmagnetic bar would stick most strongly to either end of the magnetic bar and only very slightly to the center of the magnetic bar, as long as I am not holding them together lengthwise.