Question

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

Answer 1

#See solution for details

Step-by-step 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.