Air cooled coil electromagnet ??? Hi. I'm a (very) Junior researcher I'm trying to biuld a solenoid electromagnet (air bore, not metal), But I need it in a specific size and most important I have to have it AIR COOLED (by fan or compressed air). Does anybody know if such an electromagnet will be able to produce a 4000 Gauss magnetic field? I am able to use either a high voltage or a strong current. I have some very serious lab equipment. Where can I get Information about this kind of stuff? Thanks.