点电荷对、平行长直电荷对、有限长直电荷的电力线方程和等势线(面)方程
점전하대、평행장직전하대、유한장직전하적전력선방정화등세선(면)방정
EQUATIONS FOR ELECTRIC LINES AND EQUIPOTENTIAL SURFACES OF PAIR CHARGED POINTS,PARALLEL INFINITE CHARGED STRAIGHT-LINE,AND FINITE CHARGED STRAIGHT-LINE
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