Charge as you go, for laptops and phones

By Celeste Biever WOULDN’T it be great if your cellphone or laptop started to charge as soon as you walked into your house of office? A phenomenon called “evanescent coupling” could make charging your electronic gadgets this easy. Researchers have been looking for a wireless charger for some time. One idea is to use electromagnetic induction – passing an electric current through a coil to create a magnetic field that induces a current in a neighbouring coil. This is the way devices like electric toothbrushes are charged,
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