I'll try to explain, forgive my peasant understanding (Single course on induction motors and actuators in Uni years ago) The limiting factor for distance of in

I'll try to explain, forgive my peasant understanding (Single course on induction motors and actuators in Uni years ago) The limiting factor for distance of induction charging is the strength of the magnetic field per unit area or flux. Technically you could create a magnetic field large enough to pass through an entire house, I can think of two big problems with that off the bat however. First, the Magnetic field strength drops as the cube of the distance from the source. The further you are, the less effective the charging at the same power rate. As well the magnetic permeability of air is so small (µ_0 = 4π×10−7 V·s/(A·m)), this is the reason why iron cores are used in transformers as you would lose a lot of flux to the surrounding area unless it is channeled through a permeable material. The second reason is that there would be unintended effects on other conductive materials located within the magnetic field, eg computers, copper piping. The energy losses by induction charging are usually very very high when compared to charging by traditional means (Cable).