Why do you have to \"swipe\" the magnetic stripe on your credit card to allow a

Question

Why do you have to "swipe" the magnetic stripe on your credit card to allow a machine to read it?

a.
Current reversals in the magnetism are converted to varying magnetism in the machine by Ampère's law.
b.
Sign reversals in the magnetism are converted to varying electric current in the machine by Faraday's law.
c.
Sign reversals in the magnetism are converted to sound waves in the machine by Faraday's law.
d.
Sign reversals in the magnetism are converted to magnetic reversals in the machine by Gauss' law.

Explanation / Answer

Sign reversals in the magnetism are converted to varying electric current in the machine by Faraday's law.

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