Wireless charging explained: What is it and how does it work?

Apple investigating inductive charging mat for docking portable devices | AppleInsider

Inductive charging is used to wirelessly charge electronic devices ranging from toothbrushes to cell phones. Suppose the base unit of an inductive charger produces a 1.00 ×10^-3- T magnetic field. Varying this magnetic field magnitude changes the flux through a 15.0 -turn circular loop in the device, creating an emf that charges its battery. Suppose the loop area is 3.00 ×10^-4 m^2 and the induced emf has an average magnitude of 5.00 V . Calculate the time required for the magnetic field to decr

Battery icon displaying charge level black background. Wireless charger icons. Wireless charging battery. wireless electric charger. circle, wireless electric. Inductive dock station charging devices