Have you ever wondered, how did the old vending machines knew which coin you putted in
They had a built-in coin recognizing mechanism that works in an amazing way.
A vending machine can effortlessly distinguish the diameter and weight however this cannot detect the fake coins. For discovering fake coins, which are generally built from low-priced materials, machines use a substantial magnetic field mechanism. As soon as the coin is inserted into the machine, they get exposed to a magnetic field signaling the kind of material bearing the coin.

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