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

My two initial ideas were:

1. Hang both of the bars with a string. Ideally, the magnetic bar would align itself with the earths Magnetic field, the south side pointing north. While the iron bar should experience no other external force. I don't know if this would actually work but it's worth a try.

2. My other idea is to use the file to create dust particles from the bar. Ideally the magnetic bar would release magnetic dust that would clump together. If for whatever reason the dust from both bars don''t clump, then you can lay the dust on a surface and test to see if one of the bars would attract the dust.