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正确理解“磁场”与“磁化”的联系与区别,对引导学生认识“磁铁的性质”具有十分重要的作用.磁场,是磁体周围存在并能对铁、钴、镍等物质有作用的一种特殊物质.这种“特殊物质”的特点是看不见,摸不着,但能被实验所证实.例如,用细绳系一小铁钉,当周围没有磁体时,细绳呈竖直状态;而当铁钉周围有磁体时,细绳将可能变得与原竖直方向成一定的夹角,这个变化就是磁场的作用结果.物质在磁场的作用下能发生变化并反过来影响磁场的,叫磁介质.事实上,任何物质在磁场中都或多或少地发生变化并反过来影响磁场.因此,任何物质都是磁介质.磁介质又分为三类:一是顺磁质,这类物质能使原磁场增强,如锡、铝、铂、锰、铬、硫酸铜、一氧化氮、
Correct understanding of the relationship between magnetic field and magnetization has a very important role in guiding students to understand the nature of magnets. Magnetic fields exist around magnets and can affect iron, cobalt, nickel, etc. A special substance that has a role for the substance. The characteristics of this “special substance” are invisible and intangible, but can be confirmed by experiments. For example, a small nail is tied with a string and when there is no magnet around it, The string is in a vertical state; when the magnet is surrounded by magnets, the string may become a certain angle with the original vertical direction. This change is the result of the magnetic field. The material can change under the influence of the magnetic field. The magnetic field, which in turn affects the magnetic field, is called a magnetic medium. In fact, any substance in the magnetic field changes more or less and in turn affects the magnetic field. Therefore, any substance is a magnetic medium. Magnetic media is divided into three categories: The first is the paramagnetic nature. Such substances can enhance the original magnetic field, such as tin, aluminum, platinum, manganese, chromium, copper sulfate, and nitric oxide.