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

Take the file, make some iron shavings from each bar in two distinct and separate areas, place each bar in a pile of shavings then repeat for the other pile. The shavings from the magnetic bar will most likely still be magnetic so they will be attracted to BOTH bars, the non magnetic shavings should only be attracted to the magnet. This will double the evidence that the magnetized shavings do indeed come from the magnetized bar.