英语翻译a circular plastic disk of radius r=2cm has a uniformly distributed charge q=2c on one face.a circular ring of width 0.5 cm is centered on that face,with the center of that width at radius r=1cm,in coulombs,what charge is contained within

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英语翻译a circular plastic disk of radius r=2cm has a uniformly distributed charge q=2c on one face.a circular ring of width 0.5 cm is centered on that face,with the center of that width at radius r=1cm,in coulombs,what charge is contained within
英语翻译
a circular plastic disk of radius r=2cm has a uniformly distributed charge q=2c on one face.a circular ring of width 0.5 cm is centered on that face,with the center of that width at radius r=1cm,in coulombs,what charge is contained within the width of the ring

英语翻译a circular plastic disk of radius r=2cm has a uniformly distributed charge q=2c on one face.a circular ring of width 0.5 cm is centered on that face,with the center of that width at radius r=1cm,in coulombs,what charge is contained within
一个圆形塑料盘半径r=2厘米,表面均匀分布着电荷q=2c.一个宽0.5厘米的圆环与盘面共圆心,环的径向中心在半径r=1厘米处.求环中包含的电荷量（用库仑表示）.
答：均匀分布,电量占总电量的比其实就是环的表面积与总表面积的比.表面积的比等于半径平方的比.环在圆盘的径向占从r=0.75到r=1.25cm的部分.设环上电量为x库仑.
(1.25^2 - 0.75^2) / 2^2 = x / 2
x = 0.5

一个半径为2cm的圆形塑料盘的一面上有电荷量为2c的均匀分布电荷，一个0.5cm宽（宽，不是直径），宽度的中心线的半径为1cm的圆环位于塑料盘带电面的中心。求圆环宽度所覆盖的部分电荷为多少库伦？

……我怕你没看懂，附了图

补充，应该差不多是这样，物理早忘了，还麻烦你自己做一下……

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　　a circular plastic disk of radius r=2cm has a uniformly distributed charge q=2c on one face. a circular ring of width 0.5 cm is centered on that face, with the center of that width at radius r=1cm, in coulombs, what charge is contained within the width of the ring 译文：

　　一个半径为12cm的塑料圆形盘，在其表面上有一均布的电荷（q=2c），一个宽度为0.5cm的圆环和盘面成同心圆，圆环的外沿到圆心的半径为1cm。那么，圆环宽度内所带电荷多少库仑？

　　示意图

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