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近几年的中考,越来越注重对研究问题方法的考查,这是逐步渗透新课程改革理念的具体体现。在电磁学中,对“控制变量法”的考查常以研究电磁铁的磁性这个实验为载体,电磁铁的磁性与电流的大小和线圈的匝数这两个因素都有关。如果电流和线圈的匝数同时变化,那么它们各自对电磁铁磁性的影响就有互相加强或减弱的可能,也有互相抵消的可能。在此我们采用一种科学的研究
In recent years, senior high school entrance examination, pay more and more attention to research methods and methods of examination, which is a concrete manifestation of the gradual infiltration of the new curriculum reform concept. In electromagnetism, the test of “control variable method” is often based on the experiment of studying the magnetism of the electromagnet. The electromagnet's magnetism is related to the size of the current and the number of turns of the coil. If both the current and the number of turns of the coil are changed at the same time, their respective influences on the magnetism of the electromagnet may be intensified or weakened or offset each other. Here we use a scientific research