, Sven Groot wrote

*snip*

A magnetic field strong enough to charge something at 10m distance at reasonable speed and efficiency will probably be strong enough to pull the metal fillings out of your mouth. I think I'll stick to wires, in that case.

Who says charging needs to be done magnetically? You could imagine a charger that is based on laser light (e.g. a microwave beam or an infrared beam) being used to charge a device more than a few feet away.

You'd still lose efficiency because the signal degrades with the square of the distance between the emitter and the appliance, and it won't cope with people getting in the way of the beam, and you probably won't be able to do area-of-effect charging zones to do it, but I don't see why wireless charging at 10 feet should be impossible :/

 

As you say, using magnets to do this would be bad  - it'd wipe your credit card as you go in the front door, and cripple all of your display screens (like TVs and laptops) as well Smiley