绝大多数银行卡是磁卡,其背面的磁条上均匀分布着许多铁磁性物质小颗粒。如果将磁条的表面分成许多个小格,单独控制每一格的磁性,这个磁条上就带有了信息。而所谓的消磁,指的就是磁卡上的磁性颗粒失去本该有的磁性。一般来说,消磁有3种诱因:一是外力撞击;二是高温;三是强磁场。有人担心银行卡和手机放一起,会产生强磁场干扰,造成消磁。其实,手机工作时主要依靠的是电磁波。在手机工作的频率区域内,其主要能量形式是电场而非磁场,所以手机磁场强度不足以使银 The vast majority of bank cards are magnetic cards, the magnetic stripes on the back of which are evenly distributed with many small particles of ferromagnetic material. If the surface of the magnetic stripe is divided into a number of small grid, separate control of each cell magnetic, the magnetic stripe with a message. The so-called degaussing, refers to the magnetic particles on the magnetic card should have lost some of the magnetic. In general, degaussing has three kinds of incentives: First, external impact; Second, high temperature; Third, a strong magnetic field. Some people worry that bank cards and cell phones together, will have a strong magnetic interference, resulting in degaussing. In fact, the phone depends mainly on the work of electromagnetic waves. In the mobile phone frequency region, the main form of energy is the electric field rather than a magnetic field, so the phone is not strong enough magnetic field strength