The effect is called the Lenz Effect. The moving magnet causes small magnetic fields, called eddy currents, to form in the metal (brass, aluminum foil/tube ...). These eddy currents have their own magnetic field (all electrical currents do). This is what is interacting with the moving magnet.
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Merchant Gift Cards** â You can use Amex cards as credit to purchase other gift cards that you might need. This presents another opportunity to use a cash back portal and earn a little something on the exchange. For example, ShopDiscover portal frequently offers 10% back at Kmart and Sears.