一个带负电的物体去接触验电器的金属球和靠近验电器的金属球产生的现象一样吗？请你做出大胆的猜测，并说出猜测的理由．_刷题宝

题干

一个带负电的物体去接触验电器的金属球和靠近验电器的金属球产生的现象一样吗？请你做出大胆的猜测，并说出猜测的理由．

上一题下一题 0.0难度选择题更新时间:2018-02-16 01:25:35

答案(点此获取答案解析）

解：用一个带负电的物体去接触验电器的金属球和靠近验电器的金属球产生的现象一样，都可以使金属箔的张角变大．

因为如果物体与金属球接触，物体上多余的电子会转移到验电器的箔片上，使箔片带上同种电荷，因相互排斥而张开；

如果物体靠近金属球，物体所带的负电荷与金属球中带负电的自由电子相互排斥，使金属球上的电子转移到金属箔上，使箔片带上同种电荷，因相互排斥而张开．

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