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约二百年前,英国科学家安培发现,位于磁场中的通电导线,会受到一个推力作用而运动。人们根据这一现象,发明了现在广泛使用的电动机。电动机产生的强劲扭矩又启发了科学家,如果把磁场中的这根通电导线换成一枚导电的炮弹,在磁场的作用下,这枚炮弹不就能被发射出去吗?1901年,挪威人克里斯廷·伯克兰制造出世界上第一台电磁发
About two hundred years ago, the British scientist Ahn found that the conductive wire in the magnetic field was moved by a thrust. According to this phenomenon, people invented the motor that is widely used nowadays. The strong torque produced by the motor inspired the scientist again. If the conductive wire in the magnetic field was replaced by a conductive shell, could the shell not be launched by the magnetic field? In 1901, Lister Buckland produced the world's first electromagnetic hair