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.
1 Limited use: The Angel Card can only be used in Victoriaâs Secret and PINK stores. 2  While you may also use the card at Bath & Body Works stores, you will not earn Angel Reward points on those purchases.
1 Risk of losing points: You must make at least one purchase on the card within a 12-month time span or the card will become inactive and youâll lose any accumulated points. 2  For infrequent Victoriaâs Secret shoppers, this is a major drawback.