I've just recently become aware of a few companies pursuing long range 'wireless power'. I only have a very basic physics understanding of it -- IIRC magnetic field strength, which I assume is what's being used (like wireless iPhone, toothbrush chargers), is inversely proportional to distance (1/r). Does anyone have any numbers on how this actually makes sense as a long range power source? If multiple sources were using long range 'wireless power', wouldn't the magnetic fields become non-uniform (non circular) and therefore mess it all up. How is this a feasible infrastructure solution? I have only a basic understanding of this concept from classical physics, so this question might be naive.