For plasma torus with elliptical cross-section, a feedback system with conducting shell and active control coils has been suggested.

我们取等离子体截面为椭圆，反馈系统由导壳和主动反馈线圈构成。

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By using a concise method, the charge distribution on the surface of a thick spherical conducting shell revolving in a homogeneous magnetic field is obtained.

用简单方法求出了在均匀磁场中旋转的导体厚球壳上电荷的分布，证明了在磁场中转动的导体表面电荷分布无普遍公式。

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By using a concise method, the charge distribution on the surface of a thick spherical conducting shell revolving in a homogeneous magnetic field is obtained.

用简单方法求出了在均匀磁场中旋转的导体厚球壳上电荷的分布，证明了在磁场中转动的导体表面电荷分布无普遍公式。

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