Will the

Most people are accustomed to carrying ID cards, bank cards and other cards in their wallets. However, there are rumors that "many people go to the police station to re-apply for identity cards because of ID card demagnetization, ID cards generally do not put together with strong magnetic items, and life is generally put together with mobile phones, but when mobile phones call, it is easy to demagnetize." The magnetic clasp of the woman's bag and the card swiper on the bus may cause the second generation of degaussing. "Is this true? Will various cards such as second-generation ID cards be demagnetized because of everyday objects with magnetic fields such as mobile phones?

So will the "intimate contact" of our ID cards, bank cards, and mobile phone cards be demagnetized?

Rumors say: ID cards, bank cards and other cards can not be put together with mobile phones, because it is easy to demagnetize these cards when the mobile phone calls. Is this true? There are different types of cards, and some of them do run the risk of being "demagnetized". However, no matter which one, the mobile phone will not have a "demagnetization" effect on the card.

Magnetic card: there is a black bar, easy to demagnetize

Contact IC card: small yellow tablet, afraid of static electricity

RF card: wireless, more secure

Mobile phones burn RF cards: basically impossible

The magnetic stripe of the magnetic card is made by applying a liquid magnetic material to the card or pasting it on the card with a small solid magnetic stripe. On the surface of the magnetic stripe, it is also covered with a protective medium to prevent the damage of the magnetic stripe structure due to friction. But unfortunately, for the boy who stuffed the card with thick branches and large leaves into his pants pocket, this protection is still too fragile, and it is common to break the magnetic card because of wear.

Figure 2 Magnetic stripe structure

  But careful care does not scratch is not the magnetic card will not be broken? If this were the case, there would be no word for "degaussing.". In general, the magnetic stripe is divided into three tracks (there are also simple function magnetic cards with only one or two tracks). Among them, the first and second tracks can only be read and cannot be rewritten, and the three tracks are readable and written. How to write it? It is to use a strong magnetic field to change the information of each unit of the track, which is basically consistent with the principle of tape, floppy disk, and hard disk.

Therefore, fear of strong magnetic fields has also become a common disease for them. The so-called "demagnetization" does not mean that the magnetic card has no magnetism, but also means that because the strong external magnetic field destroys the original information, the card cannot be used. Magnetic cards should indeed not be too close to strong magnets or objects with strong electromagnetic wave emissions. However, in general, the magnetic field generated by mobile phones is not enough to demagnetize magnetic cards, please see the video of this experiment done by the Fruit Shell Experimental Party with mobile phones, magnets and bank cards

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