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一、实验装置如图1所示,培养皿中放入食盐水,在其中心放一个圆柱形电极,沿边缘内壁放一个圆环形电极,把它们分别与电池的两极相连.为了使实验能进行多次对比,并且使现象明显,采用如下做法:(1)用学生电源,以方便改变电压;(2)食盐水的浓度达到饱和,且食盐水的量不超过容器容积的2/3为宜;(3)为了清晰观察水的运动方向,可在水中放入很轻的悬浮物,如花粉、泡沫颗粒等,通过悬浮物的运动来观察水的运动情况.二、实验现象通电后,食盐水的液面会逐渐旋转起来.如果调换电源的正负极,液体旋转的方向也会与原来相反.如果将磁铁翻过来放置,即调换磁场的方向,液面旋转的方向也会相反.同时两
First, the experimental device shown in Figure 1, the petri dish into salt water, put a cylindrical electrode in the center, put a ring-shaped electrode along the edge of the inner wall, and they are connected to the two poles of the battery. In order to enable the experiment to Make multiple comparisons and make the phenomenon obvious. Use the following practices: (1) Use student power to facilitate voltage changes; (2) Concentration of salt water reaches saturation, and the amount of salt water does not exceed 2/3 of the container volume. Appropriate; (3) In order to clearly observe the direction of movement of the water, can be placed in the water, very light suspended matter, such as pollen, foam particles, etc., through the movement of the suspension to observe the water movement. Second, the experimental phenomenon after power, The liquid level of the saline solution will gradually rotate. If the positive and negative poles of the power supply are reversed, the direction of rotation of the liquid will be opposite to the original. If the magnet is turned over and placed, the direction of the magnetic field will be reversed, and the direction of rotation of the liquid surface will be reversed. Both