真空中有一带负电的电荷绕固定的点电荷 q运动其轨迹为椭圆如图所示.已知abcd为椭圆的四 个顶点 q处在椭圆焦点上则下列说法正确的是 Template




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tomski真空中有一带负电的电荷绕固定的点电荷 q运动其轨迹为椭圆如图所示.已知abcd为椭圆的四 个顶点 coloring