题目内容
现有三个相同的绝缘金属球A、B、C,其中A球带电荷量为+8Q,B球带电荷量为-2Q,C球不带电。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006357232500.jpg)
(1)保持A和B的位置不变,而将C先与A接触,再与B接触,最后移走C球,则此时,A与B之间的库仑力是原来的 倍。
(2)若将C球与A、B球反复接触足够多次,最后移走C球,则此时A与B之间的库仑力为原来的的 倍。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006357232500.jpg)
(1)保持A和B的位置不变,而将C先与A接触,再与B接触,最后移走C球,则此时,A与B之间的库仑力是原来的 倍。
(2)若将C球与A、B球反复接触足够多次,最后移走C球,则此时A与B之间的库仑力为原来的的 倍。
(1)
(2)![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635739303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635739303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635739303.png)
试题分析:(1)由电荷守恒定律C先与A接触,将A的电荷量平分,这时
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635770987.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635786992.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635817889.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635739303.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006358481313.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635817889.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000635739303.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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