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(gè)表面導(dǎo)電的輕質(zhì)球懸掛在一根細(xì)金屬線上，讓該球繞其豎直方向旋轉(zhuǎn)（從而使金屬線轉(zhuǎn)動(dòng)扭曲）后釋放，輕質(zhì)球開始往復(fù)扭動(dòng)。試研究該運(yùn)動(dòng)是如何受周圍磁場(chǎng)影響的。