The paper presents electric field of dielectric sphere and ellipsoid in homogeneous electric field, with spherical and ellipsoidal coordinates.
本文用球坐标和椭球坐标计算了处于均匀外场中的介质球和介质椭球的场，其内部的场都是与外场方向相同的均匀场。
The rotary inertia of an ellipsoid rotating around the symmetry axis is calculated by use of the divided calculation and the extensive spherical coordinate transformation.
用分步计算和广义球面坐标变换两种方法对椭球体绕对称轴旋转的转动惯量进行了计算，计算表明，后一种方法简单、实用，在工程实际中有应用价值。
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