Card Swipe Reader
Credit Card Reader (Physics)?
“When a credit card is “swiped” through a card reader, the information coded in a magnetic pattern on the back of the card is transmitted to the card holder‘s bank. Why is it necessary to swipe the card rather than holding it motionless in the card reader‘s slot?”
yes the above is correct, but on physics terms it is because movement through a magnetic field induces current in the system (perhaps a coil of wire). The current is then picked up by the "electronics". If no movement, no induced current, and you have a "dead battery"
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