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