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

Make some filings of each onto a sheet of paper. Then place the large piece under the paper. The magnetic filings will react to the magnet. The non magnetic filings will not react to the non magnetic bar. 

Bonus answer: use the mallet to bang a paper clip into the ceiling. Use the rope to dangle them each. The magnet will always try to align itself in the same orientation relative to earth's magnetic poles (when balanced) whereas the non-magnet will lay in whichever has the least slack.