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.

      将一个表面导电的轻质球悬挂在一根细金属线上，让该球绕其竖直方向旋转（从而使金属线转动扭曲）后释放，轻质球开始往复扭动。试研究该运动是如何受周围磁场影响的。