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高中物理下册第三章第三节《直线电流的磁场》,主要是定量地研究通电直导线产生的磁场的磁感应强度与电流强度和离导线的距离的关系:B=K(I/r)。得出这个关系的关键是成功地做好《确定直线电流磁场的实验》。对于这个实验,教科书和教学参考书中所说的都是让直导线处于竖直状态,立于桌边。为此,需要把漆包线绕在木框槽内,还要在竖直木框中间放置一水平板,还需要安装底座支架等。这样一来,整个实验装置就显得笨重了,而且小磁针两极受到直导线磁场作用力大小不一致,磁针偏转时偏角更不够准确,所以实验不太成功。达
The third chapter of High School Physics Volume 3, “Magnetic field of linear currents”, mainly studies quantitatively the relationship between the magnetic induction intensity and the current intensity and the distance from the wire of a magnetic field generated by a live wire: B=K(I/r) . The key to this relationship is to successfully perform the “Experiment to determine the linear current magnetic field.” For this experiment, textbooks and teaching reference books mentioned that the straight wire was placed vertically and stood at the edge of the table. For this purpose, it is necessary to wrap the enameled wire in the groove of the wooden frame, and also to place a horizontal plate between the vertical wooden frames. It is also necessary to install a base frame and the like. In this way, the entire experimental device becomes unwieldy, and the small magnetic needles at the two poles are inconsistent in the magnitude of the magnetic field force of the straight wire, and the deflection angle of the magnetic needle is less accurate, so the experiment is not very successful. Up to