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.
Thankfully, a lot more stores today are selling gift cards that can be used online as well as at your local brick & mortar store. CVS, for example, carries gift cards for dozens of different companies, including Amazon.All you need to do is take the gift card to the cash register and the clerk will activate the card once you pay for it. You can usually find Amazon gift cards at CVS for the values $25 or $50.any supermarkets now have Coinstar machines so you should be able to get that gift card taken care of before you have to arrive at the party. If you need more tips, check my complete list of stores for where you can buy Amazon gift cards and hopefully there is one on the list that can help you out.