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To read the magnetic strip on an ID or credit card, you must swipe it quickly past a tiny coil of wire. Why must the card be moving for the coil system to read it

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opudodennis

Answer:

#See solution for details

Explanation:

--The coil needs current for it to be able to read the strip.

-On a moving magnet or changing magnetic field will provide the electric field required to push induce the current needed.

-A moving magnet will induce a current in the coil so that the magnetic strip can be read.

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