Where
wiki Tesla unit 0.02T is a quite powerful magnetic field.
I'm skeptical of these numbers because of a very simple experiment I've done to demonstrate the relationship between electricity and magnetism. Get a magnet and a metal, non-ferrous pipe of similar size. I use extruded aluminum and (extruded or molded?) schedule 40 PVC because both are very smooth and can't 'snag' the magnet. I usually use a thin bar magnet for this trick, although round magnets work better (Shorter magnet-conductor distance).
Using a stopwatch, drop the magnet through each vertical pipe. [edit: For clarity. I get much longer times in the aluminum tube than the PVC tube. The speed appears to reach a constant value, meaning that the acceleration reaches 0. The magnetic Lentz force must accelerate it upwards at 1G to cancel out gravity]. While not tremendous, the magnet does weigh about 1 newton, meaning that a modest speed of conductor produces 1 newton of force in a magnet at low speed. The experiment works well for metal plates, though there is certainly less force produced due to decreased eddy currents.
It seems to me that if I make a wheel with one magnet in it, the magnet will brake when near a moving metal object. This will rotate my small wheel and bring the magnet around again. I will not have a chance to produce a video of this, but the principle seems to follow
directly from the above experiment. Stronger magnets could probably let me get a watt or two from this, but I have not tried it. I don't think I will, but I thought I'd chime in on "Making useful power with eddy currents requires vaporizing metals." I feel that that is a false statement because of producing 1 newton at low speed.