在《电场》一章中,会遇到一些由于电量减半而引起动态变化的问题.这些问题用常规的方法很难求解;如果方法不得当,也极易走入误区.但会用一些特殊的方法,如比例法、相似法等,解起来就很方便.下面谈谈这些方法的应用. In the chapter “Electric Field”, you will encounter some problems caused by the dynamic changes caused by the reduction of the electric quantity. These problems are difficult to solve with conventional methods; if they are inappropriate, they can easily fall into the wrong zone, but they will use some Special methods, such as proportional methods, similar methods, etc., are easy to solve. Here’s a discussion of the application of these methods.