Comment on Electromagnet for attracting copper
Electromagnet for Attracting Copper, Aluminum and Non-Ferrous Metals like GOLD! https://www.youtube.com/watch?v=_mQeaKkaEcQ Yes, vary the frequency and measure the force response. A spectrum is easier to use and understand. There should be specific resonances for each kind and shape of material. Electric and magnetic polarization studies of materials have been tried since earliest days, but have
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