反证法(又称归谬法)是一种常用的论证方式,它首先假设某命题不成立,然后推理出明显矛盾的结果.反证法在数学中经常运用,当论题从正面不容易或不能得到证明时,就需要运用反证法.其实在物理习题中有许多地方也可以用到反证法,下面我们用实例来说明反证法在解电学题中的应用. It is a commonly used method of argumentation, which first supposes that a certain proposition does not hold, and then infers obvious contradictory results.Revidence law is often used in mathematics, and when it is not easy or can not be proved from the front, In fact, there are many places in the physical exercises can also be used against the law, the following we use examples to illustrate the application of proof in solving electrical problems.