Magnets can't slow down the school bathing machine. Conversely, if the water card is a magnetic card, the magnet will invalidate the water card. However, bus cards, access cards, meal cards and other cards are not magnetic. They use contactless smart cards and adopt radio frequency technology. The information of these smart cards is stored in the semiconductor chip, so there is no degaussing problem.
At present, only those unimportant membership cards with no chips and only magnetic stripes can be degaussed, because the information storage of these cards is recorded by partially magnetizing black magnetic stripes. If it is eroded by strong magnetism and external mechanical friction, the orbital magnetism will be disordered or damaged, and it will naturally be impossible to identify information.
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The electromagnetic field emitted by the mobile phone cannot disable this part of the card. Under normal use, the energy emitted by mobile phone is in the form of electric field, which is not enough to change the magnetic field of magnetic stripe information. Moreover, the current magnetic stripe card is exquisite and advanced in technology, and will not be easily degaussed.
Another magnetic field comes from permanent magnets, such as neodymium magnets. In fact, there is a chip in the bus card, called contactless chip card, which consists of antenna, MPU microprocessor and FLASHROM.