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I'm trying to build a high powered, lightweight, (long lasting?) electromagnet. I know it requires a nail, wire, a battery, etc. but I have some questions about that.1. What wire should I use? (What gauge) 2. How many times should it be wrapped? (Layers?)3. What material should it be wrapped around?4. What voltage/battery size will give the most power?5. Can it be done to be fitted into a tube roughly 1.5-2 inches in diameter?I appreciate your help!