The difficulty with making a motor this small, says Makoto Ueda of Toshiba, lies in winding small enough coils of wire in the motor. (newscientist.com)
At the heart of each tiny transformer is a magnetic cube a few millimeters across, which Rus» team «drove,» using magnetic coils of wire called solenoids as remote controls. (sciencenews.org)
PEMF uses pulsing magnetic fields, developed by pulsing a small amount of battery current through coils of wire, to initiate normal biological cellular reactions that result in improved circulation and provide pain relief. (shirleyvet.com)