I need help building a demagnetizer. As far as I know, I can demagnetize a steel part by passing it slowely through an alternating magnetic field. So I want to make a large solenoid by wrapping wire around a large cardboard tube and then passing the part through it. But I don't know enough about electricity and magnetism to know what size wire to use and how many turns. I have either 120 or 240 volt AC.
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