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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Dated: Jul 12, 10
Graded Moderated Discussion Board for the course PHY101 (PHYSICS) will start on Tuesday 22th July 2010.
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The topic for the discussion is
“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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