Hello! My first post at Physics Forums! Nice to meet you! In an electromagnet, where the coil windings are not touching themselves (the coil is not touching itself), is there any difference on the magnet strength created depending on whether the wire is insulated or not (bare wire)? If the coil windings were touching I would understand that the current would just short cut kind of in a straight line over the coil but in this case they are not. It will be only a few windings and they are not touching (a relatively weak magnet). But would it make a difference in this case if the wire was bare or insulated? Added comment: it is insulation between the core (iron) and the coil itself. Thanks.