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初中物理与高中物理教学中,关于奥斯特演示实验存在两个困难:一是,本实验若用J206型小磁针,由于地磁场影响,单导线电流要大于0.3A才可偏转,但大部分学生仍看不清。若用J205型磁针,单导线电流要大于0.5A才略有偏转,此电流已大于R20型的额定电流,这样极大地缩短了干电池的使用寿命,对于条件差、以干电池为主要实验电源的农村中学来说,浪费太大。二是,目前中学物理实验室所用的几种磁针均为竖直轴,磁针在水平面旋转,课堂演示可见度甚差。鉴于此,我设计并制作了一种较为理想的仪器——电流磁场演示仪。特点是:
In the junior high school physics and high school physics teachings, there are two difficulties in Oerster’s demonstration experiment: First, if J206 type needles are used in this experiment, the single-wire current can be deflected by more than 0.3A due to the influence of the geomagnetic field, but most The students are still not clear. If J205 type magnetic needle is used, the single wire current should be deflected slightly larger than 0.5A. This current is larger than the rated current of R20 type, which greatly shortens the service life of dry batteries. For rural schools with poor conditions and using dry batteries as the main experimental power source For waste, it’s too much. Second, several magnetic needles used in the middle school physics laboratory are vertical axes, and the magnetic needle rotates in the horizontal plane. The visibility of the classroom demonstration is very poor. In view of this, I designed and produced a more ideal instrument - current magnetic field demonstrator. feature is: