The recorded information of bank cards and bankbooks are stored on the magnetic stripe on the back. The strong magnetic field generated by high-frequency electromagnetic waves generated when the mobile phone works will magnetize the credit card, making the recorded information disordered, thus leading to the invalidation of the bank card. At the same time, some citizens put mobile phones, bank cards and other items together in their bags, which can easily lead to the bank cards being "degaussed".
In addition, if the magnetic strips of two bank cards overlap, they are likely to be demagnetized at the same time. In addition, some medical inspection equipment such as the magnetic hidden buckle of the lady's handbag and the nuclear magnetic resonance instrument will also cause the bank card to be magnetized.
The most common magnetic cards in life are bank cards and shopping cards. These cards are embedded with magnetic strips to store information. When the magnetic stripe touches an object with strong magnetic field, the information stored in the magnetic stripe will be destroyed and "disordered", which is also commonly known as "degaussing".
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The ways to prevent magnetic cards from degaussing are: try to stay away from the high magnetic field around induction cookers, microwave ovens, televisions, refrigerators and other electrical appliances, and try not to put them together with magnetic objects such as mobile phones, computers, palmtop computers, magnets, music stars, business contacts or possibly magnetic metals.
Don't throw the magnetic card in the messy bag at will to prevent sharp objects from being worn, scratched, twisted or broken; Don't store multiple bank cards together, and don't put them back to back, so as to avoid the magnetic strips rubbing against each other.