The device sure looks like an electromagnet made with magnet wire and a steel core. But when he shows the ends of the core, you’ll see that the side that attracts aluminum has a copper ring ...

As the ring ascends, it slows and cools down due ... with potential uses in communication and wireless technology, electromagnetic vortexes – or donuts to the hungry – had never been observed ...

A crystal oscillator pulses a relatively large electromagnet. A small plastic gear has a magnetic ring and sits near the electromagnet. Each time the polarity of the electromagnet flips ...