how to create an alternating current magnet?

Answer 1

Here's an explanation:

http://www.physics.ucla.edu/demoweb/demomanual/electricity_and_magnetism/electrodynamics/lenzs_law.html

And here's a video of a superconductor magnet (really cool):

http://www.youtube.com/watch?v=nrUdT8er0Dk

Answer 2

Use soft iron, so that it can easily change its magnetic polarity and wrap it with lots of turns of wire and then connect it to an AC current. Make sure you do this safely. There are many AC relays that are use AC magnets to operate.

Answer 3

i dont think you can, its a thought though i guess