[rouletteroulette]

...that you can make at home. this demonstration can demonstrate to you the nature of counter-rotating fields that are created with magnets. it's fun. atoms to galaxies do counter-rotating spins on the same principles in this demonstration.


get several donut-shaped magnets; round ones with holes in the middle of them, the small ones 1" in diameter with 3/8th-inch openings are best.


get a smooth, round pencil or stick.


get a vibrating device, like an electric hair cutter (like a "wahl" model) that vibrates with a fairly good shake; a vibrating sander is even better.


plug the vibrating device in. put the pencil/stick in vertical contact with the vibrating part of the vibrating device. slip on the magnets with the repelling ends facing each other so that the magnets will remain repelled apart as they slide on the stick. turn on the vibrator device and watch the magnets counter-rotate with each other while the stick/device shakes.


i've put on as many as five magnets on a stick and every single one of them counter-rotated with each other beautifully when i turned on the vibrator.


try it.


just don't try to turn it into a sex toy. oh, wait, maybe that's a good idea... :d