Description: Full tutorial video link above the title. Materials I used: Soft copper wire: wire size to make pendant with diameter of stones 14 - 16mm 20 gauge (wire diameter 0.8mm): 25cm (10 inch) 28 ...

I had cause to demonstrate the magnetic field around a wire, and ended up with an 8A current in a vertical wire, battling with the Earth’s magnetic field. My borrowed idea was to put a ring of eight ...