some other related applet:
http://micro.magnet.fsu.edu/electromag/java/faraday2/

http://phet.colorado.edu/simulations/sims.php?sim=Faradays_Electromagnetic_Lab   select Pick up coil
Like: this [img]http://phet.colorado.edu/images/phet-logo.gif[/img] is so amazing, i don't feel like making another similar one in Ejs.