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在解答电学某些试题时,若能针对问题进行一些合理而又巧妙的假设,就会使问题易于理解、易于分析和求解,收到化难为易的功效.1 假设可能答案[例1]用一根带有正电的塑料棒靠近小通草球,通草球被吸引.则通草球A一定带正电.B.一定带负电.C.一定不带电.D.可能带负电或不带电.解析:假设小球带正电则会与棒互相排斥;假设小球带负电,则会被异种电吸引;假设小球不带电,也会被带电棒吸引;从而判断小球有带负电或不带电两种可能,故应选D.
When answering some questions in electricity, if we can make some reasonable and ingenious assumptions about the problem, it will make the problem easy to understand, easy to analyze and solve, and it will receive the effect of making things difficult. 1 Assuming possible answers [Example 1] A positively charged plastic rod is close to the small pass grass ball, which is attracted by the grass ball. Then the grass ball A must be positively charged. B. must be negatively charged. C. must not be charged. D. may be negatively charged or not. : Suppose the ball is positively charged and it will be mutually exclusive; if the ball is negatively charged, it will be attracted by different kinds of electricity; if the ball is not charged, it will be attracted by the charged stick; thus, it can be judged whether the ball has negative or no charge. Two possibilities, it should be selected D.