Each strip can be considered a line charge.
每一条可视作一根线电荷。
So far both the formula for energy of line charge and the condition of electrostatic equilibrium have not been directly derived from the current electromagnetism.
现行的电磁学对线电荷的能量公式、静电平衡条件都没有直接推导过。
One morning to his delight, he saw the animals form in line, charge and then retreat, and afterwards gallop about, appearing greatly contented with the lot that had befallen them.
一天早上，他欣然看见十二匹马排成一列，向前冲锋，继而退却，然后四处奔驰，似乎对命运十分满意。
One morning to his delight, he saw the animals form in line, charge and then retreat, and afterwards gallop about, appearing greatly contented with the lot that had befallen them.
一天早上，他欣然看见十二匹马排成一列，向前冲锋，继而退却，然后四处奔驰，似乎对命运十分满意。
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