This is a presentation for the upcoming hoverboard in October, 2015.

11. “The magic behind the hover board lies
in its four disc-shaped hover engines.
These create a special magnetic field
which literally pushes against itself,
generating the lift which levitates our
board off the ground.”

12. A localized electric current induced in a conductor
by a varying magnetic field.
An induced electromotive force (emf)
always gives rise to a current whose magnetic
field opposes the original change in magnetic flux.