Demonstrated By: Nikola Tesla, MIT (2007), WiTricity, others
What Happens:
A transmitter coil generates an oscillating magnetic field at a specific frequency. When a receiving coil tuned to the same resonant frequency is nearby, it picks up energy efficiently and selectively, even at a distance. This is frequency-selective energy transfer and represents a clear physical coupling between object and EM field.

The Idea:
This mechanism is exactly how a hovering car could draw power from a “sky lane” at a given altitude. Only objects tuned to the right frequency couple with the field — a weak form of frequency-based “locking.”