There is a post on this forum stating that the insulation should be left on the wire to prevent a short circuit thus making the electromagnet ineffective. Lost the link and can't find it now. But I am finding multiple articles on the internet that are using bare wire. Ex of bare: http://www.wikihow.com/Create-an-Electromagnet Ex of insulated: http://www.energizer.com/learning-center/science-center/Pages/make-electromagnet.aspx There are multiples on the web of both versions of creating the electromagnet, both insulated and non. Why is either version working? Is there a right way or a wrong way?