演示两条平行直导线电流的相互作用,除采用高中物理第三册第2页图1-3所示的装置外,还有采用两条平行铝箔带的装置来投影。但这两种演示实验装置的演示效果都不好。其主要原因有:1.大多数学校(如初中)无大电流电源,上述装置所产生的磁作用受到金属丝(或箔带)本身张力的阻碍,产生的平动效果甚微,可见度很小;2.采用瞬时短路法使电流通过直导 Demonstrate the interaction of two parallel straight wire currents, in addition to the device shown in Figure 1-3 on page 2 of High School Physics Volume 3, and the use of two parallel aluminum foil strips for projection. However, the demo effects of these two demonstration experimental devices are not good. The main reasons are as follows: 1. Most schools (such as junior high schools) do not have large current sources. The magnetic effect produced by the above devices is hindered by the tension of the metal wire (or foil ribbon) itself, resulting in little translational effect and low visibility. 2. Adopt the instantaneous short-circuit method to make the current through the direct conductor