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

To answer the second riddle you can, for example, take a plate of a non ferromagnetic metal (copper for ex.) and try to move the two pieces of iron above it: if the magnet is strong enough you should fell a force opposite to your movement; an other way to know whitch one is magnetic is to drop them in a copper pipe and for the same reason the magnetic bar should fall slower.