Originally Posted by spirulina
Thank you, so o.k. to put it in Lehmans terms then just flip them till they are on the side that has a stronger "attraction" for lack of better words? Did you use just one of them??? Many thanks
North poles only attract south poles and vice versa. Stir bars tend to be north on one end and south on the other, even when they are build of two magnets. If you use 2 magnets on your stir plate, you have to make one north pole up and one south pole up or both sides of the plate will be trying to attract only one side of your stir bar, rather than each magnet separately attracting one side of the bar and matching the spin.
So.. not stronger attraction exactly, but one side will attract and the other will repel, so as long as one is up and one is down on the plate it will be able to match with the bar. Just make sure the two magnets you use for the plate attract each other on the sides you use in the up position like on the bottom picture below. On my plate, I only used one to save magnets, but I understand that when used correctly two magnets create a stronger field. No worries at all