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MIT researchers are working to provide wireless power over short distances (several meters), using resonance to tune the power to the device.
Soljacic and his colleagues have come up with a way to transfer energy over several meters by tuning electronic gadgets to "resonate" with a magnetic field put out by a power transmitter. Most of the energy not used by attuned gadgets would be reabsorbed by the emitting device. The result, once the technology is commercialized, could be power outlets that transmit power wirelessly to any device in the room.
Some questions remain. Among them is how safe will this be for the human body. There are already concerns about electromagnetic fields associated with high power transmission lines, among others. It seems like the new technology will be generating more than a bit of an electromagnetic field in the area where this wireless power will be used. Is that safe? No one seems to have an answer to that question.
magnetic resonance technology
how safe will this be for the human body
He did many demonstrations showing no ill effects & lived to a ripe old age