I have a device like this one: http://www.youtube.com/watch?v=kA_hw_lY-OY
(All of them work the same)
Here's an image:
I want to make it spin without touching it with hands.
I tried using magnets of several kinds, and tried to put them in many places around it but it didn't make it spin. It just made it to vibrate a little.
I guess there is a point in which the "pen" will spin and spin. Basically, I prefer to make it rotate not with magnets, but with an electric current. Most likely, I will use an AC generator, and it also makes sense, because I thought that in some point there will be same poles, and then the pen will spin a little bit, and then there will be different poles, but the alternate current changes the poles each time, so the poles will always be the same.
My question is: in what point should it happen?