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juice wrote:yeah

pretty handy with your right hand, aren't you?

i did that experiment last spring, and you're actually looking at an electron ring. because electrons are charged particles, we use the Lorentz force law [F = q(E + v x B)] to find out how they move. in this experiment, you make B perpendicular to the initial velocity provided by a high voltage between the anode and the cathode (which has a small aperture) so you get a nice halo of electrons. so you're not really directly looking at the magnetic field.

also, helmholtz coils are pretty cool.

Slightly off topic, but very cool nonetheless are Ferrofluid sculptures.

http://youtube.com/results?search_query ... rch=Search

I like them.

Or you can just take a magnet and put it on a television screen. You'll SEE the fields effect the tv screen in various colors.