I am working on a project to make a large scale electromagnet and try as I might I just cant get past one part. Getting it to magnetize. I have built the unit primarily out of a 5 ft rod of threaded steel (I will be replacing it with iron I just happened to have the rod already) wrapped in a copper wire that covers 3.5 ft of the rod. My problem is that no matter what i hook up for a power source I simply cannot get it to magnetize I started from a design that indicated a few 9 volt batteries up to a battery out of a semi that weighs 80 lbs and even a few DC adapters all that came with the same result. I ran as many tests as I could think of to find the solution I used a multimeter to measure the volts with and without the wire connected i powered some LEDs through the wire and even hooked up a semi battery witch resulted in the plastic on the wire to actually boil but still not even enough force to pick up a paper clip. I just don't know what else to try or where else to look any help would be greatly appreciated. I assumed this is large scale as all the pages i have found primarily talked about using nails for the core this is even just a prototype for a much larger project for moving scrap metal.