Oscillating Sphere

A light sphere with a conducting surface is suspended from a thin wire. When the sphere is rotated about its vertical axis (thereby twisting the wire) and then released, it starts to oscillate. Investigate how the presence of a magnetic field affects the motion.

      將一個表面導電的輕質球懸掛在一根細金屬線上，讓該球繞其豎直方向旋轉（從而使金屬線轉動扭曲）后釋放，輕質球開始往復扭動。試研究該運動是如何受周圍磁場影響的。