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本文介绍一个简单的课堂演示实验,以验证库仑定律的反平方特性。所用仪器简单,且几分钟便可完成。用长线悬挂两个带等量电荷的木髓球,再使它们所带电荷减半,测量两种情况下的距离之比。无须测量电荷、质量或力。本实验典型精度约2％。
This article presents a simple classroom demonstration experiment to verify the anti-squared property of Coulomb’s law. The instrument used is simple and can be done in a few minutes. Suspend the two medullary balls with equal charge with a long line and then halve the charge they carry, measuring the distance ratio between the two cases. No need to measure charge, mass or force. The typical accuracy of this experiment is about 2%.