TTiger2k7

I apologize to the creator of the thread that this is kind of off topic, but I am also creating an electromagnet. It's purpose is to securely hold a regular hotwheel. I was wondering what is the best list of materials that I can use, that is also the cheapest.

Hi, I'm TTiger2k7, a high school senior. I'm about to study engineering next year in college. Nice board you guys got here. :)