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

you can solve this with the two bars only. if you stroke in a singe direction at one end with the bars perpendicular instead of end to end  you will only magnetize the one end of the non magnetized bar. done this way one bar will have an end that attracts both ends of the other bar and the other end will attract and repel the two opposing ends of the other bar... this is the non (previously)magnetized bar. technically the entire bar will be magnetic just significantly more strongly at one end than the other . have done this many times with screwdrivers for a quick if temporary magnetization and noticed that only the one end ends up noticeably magnetic.