Sorry, I misread your first post. You did get this to work with the car battery? I'd use that setup and test your three bolts. See which one is the best electromagnet for a set number of coils. Count how many paper clips it can pick up or something. Which ever one is best is the lowest carbon steel, and will make the best electromagnet of the materials you have. (The amount of carbon in the steel determines the hardness and the magnetic properties. Higher carbon steel is very hard, but not magnetic. Low carbon steels is soft, but magnetic. You probably can make an electromagnet out of any type of steel, assuming enough current, which I guess is what you proved.)Louise wrote:The advice I quoted said that steel bolts with any hardness number was unusuable.Bluerose17 wrote:and we have already searched all topics realting to spark- spark gaps- and the project create your own spark
My best advice at this point is what I suggested in the previous post. Use the rebar. Look at the electromagnet project for ideas. And again, how are you testing that it is an electromagnetic.
Oh, and you did scrape of the insulation where you connected it to the battery, right?
Louise
The magnetic field induced will be related to the number of coils. That is why neatly wrapping is better, so you can fit more in.
Louise