Safety first Fragile! Avoid high impact Keep away from electronic equipment Keep away from medical appliances Keep away from measurement devices Keep away from mobile phones Keep away from watches Do not consume Keep away from fire Get to know your Feel Flux Feel Flux gets even more exciting if you know what happens under the hood. It has nothing to do with the well known attracting or repelling magnetic force—the underlying principles are based on an effect called Lenz's law. Here is what happens when you drop the ball in the tube. The movement of the falling ball creates a changing magnetic field inside the metal wall of the tube. According to Faraday’s law of induction, the changing magnetic field induces a voltage inside the wall of the tube called electromotive force. Because the tube is made of well conducting metals, this voltage creates eletric currents that flow round-and-round. These are called eddy-currents. According to the law of excitation, the flowing eddy-currents generate a second magnetic field that can affect the magnetic field of the ball. Lenz’s law states that this additional magnetic field is always directed to oppose the motion that has generated it: the movement of the ball. The faster the motion, the stronger the slowing force gets. When the ball stands still you feel no attraction at all. This dynamic behavior makes Feel Flux so satisfying to play with.
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