1·Through electrostatics and examples of low-frequency alternating current and direct-current circuit, the problem of zero potential point is queried and clarified.
通过静电学、低频交流、直流等电路实例，质疑了电势零点问题，并对此进行了澄清。
2·The Visualizations section offers multimedia tools that demonstrate various physical phenomena, including Vector Fields, Electrostatics, Magnetostatics, Faraday's Law, and Light.
视觉化教材的部份提供了用来展示不同物理现象的多媒体工具，包括向量场、静电学、静磁学、法拉第定律和光。