如图所示一个均匀的带电圆环带电量为 Q半径为r放在绝缘水平桌面上圆心为o点放o点做一竖直线在此线上取一点a使a到o点的距离为r Template




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tomski如图所示一个均匀的带电圆环带电量为 q半径为r放在绝缘水平桌面上圆心为o点放o点做一竖直线在此线上取一点a使a到o点的距离为r coloring