Si et pica la curiositat
http://www.sc.ehu.es/sbweb/fisica/elecmagnet/elecmagnet.htm
http://www.gr.ssr.upm.es/eym/welcome.htm
http://www.geocities.com/SunsetStrip/Amphitheatre/5064/motorel.html
http://fly.hiwaay.net/~palmer/motor_sp.html