because the code is in encrypted form so that's why it need to be swap and electromagnetic waves read that spot which got the hidden code to be read.
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“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?”
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because the code is in encrypted form so that's why it need to be swap and electromagnetic waves read that spot which got the hidden code to be read.
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