有文字记载,我国是发现磁现象和应用磁性材料最早的国家。随着科学技术的不断发展,人类对磁现象的认识,经历了一个不断深化的过程,对磁效应的应用亦愈来愈广泛,如今人类已将磁效应应用到工业、农业、医疗卫生等各个技术领域,人类对磁现象的研究,巳发展成许多学科不可缺少的组成部分。 There are written records, our country is the earliest discovery of magnetic phenomena and the application of magnetic materials in the country. With the continuous development of science and technology, human’s understanding of magnetic phenomena has undergone a continuous deepening process and its application to magnetic effects has become more and more widespread. Nowadays, human beings have applied magnetic effects to various fields such as industry, agriculture and health care In the field of technology, the study of magnetic phenomena in human beings has developed into an indispensable part of many disciplines.