Hello guys/gals I have a few questions regarding electromagnets that I'm hoping you can shed some light on for me. I don't know much about physics, magnets, etc. I am a career firefighter that is trying to build something requiring the use of electromagnets. 1. I'm trying to have an electromagnet be able to repel another magnet (not electromagnet). When I electrically charge the electromagnet, does it automatically have a N and a S pole? Can I change what side is which? Also, is it constant which side is which when I charge it or does it change? 2. If I put more current to the electromagnet, does the repelling force increase? 3. What exactly are magnets made of? Can I weld other metals to it? 4. Is there a good place online to purchase magnets/electromagnets? I'm looking for about 2" diameter and 1" or 2" height cylinder. 5. Is there any material that can cancel the magnetic force? Example, some kind of material that I can wrap around the electromagnet and magnet to cancel out the magnetic field so it doesn't affect other things around it? Hopefully everything made sense. I'm sure I'll think of a few more questions in the near future. Thank you so much for any help you can provide.