用电象法解介质的静电边值问题,在提出试探解时,往往要涉及运用不同介电常数(下简称ε)的问题,几年来的教学中发现学生对该采用什么ε常常产生误解,认为只可用某一确定的ε而不可用别的,否则便没有物理意义。这种认识是不全面的,它限制了解题的思 Electrostatic method to solve the problem of electrostatic boundary value of the medium, the proposed test solution, often involves the use of different dielectric constant (hereinafter referred to as the problem), the past few years of teaching found that the use of what ε often misunderstood, We think that we can only use a certain ε but not something else, otherwise we have no physical meaning. This understanding is not comprehensive, it limits the problem of thinking