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If you have ever looked at a plastic credit card, when you turn it over so that you are looking at the back (where the box is for you to sign it) you will find a brown/gray stripe about a centimeter wide that runs across the entire width of the card. This is a magnetic strip. It is made of very finely ground up Iron particles in a glue covered by a thin film of plastic. When a strong magnetic field is applied to the strip it is possible to magnetize areas of the strip in a pattern. The pattern contains information about what the card can be used for and who it can be used by.

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16y ago

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