- #1
cragar
- 2,552
- 3
Sometimes when i swipe my card at walmart it doesn't read it , And the guy was like let's put it a plastic bag and then try it, and it works and I've heard a couple of other people doing this.
So when i slide my card the magnetic strip induces a voltage and reads the card. So why does putting it in a plastic bag work. Does this change the relative permittivity of the material.
Does the bag just add more di-electric material so the magnetic field interacts with the detector in the card reader like it should and not too strongly.
Any input will be much appreciated.
So when i slide my card the magnetic strip induces a voltage and reads the card. So why does putting it in a plastic bag work. Does this change the relative permittivity of the material.
Does the bag just add more di-electric material so the magnetic field interacts with the detector in the card reader like it should and not too strongly.
Any input will be much appreciated.