Finally, the fourth property of electric field lines: the lines must never cross.

最后，场线的第四个属性 电气，线路不应该交叉。

The third property of electric field lines is that the lines always start from positively charged objects and end on negatively charged objects.

场线的第三个特性是它们总是开始 的积极元素和结束于消极。

The lines point from the north pole to the south pole – like how electric field lines point from the positive to the negative charge.

这些线从北极指向南极——就像电场线如何从正电荷指向负电荷一样。

These vectors are called electric field lines and their purpose is to show the magnitude and direction of the force exerted on any nearby positive test charge.

这些射线称为电场线。给 任何正测试电荷上的力的值和方向。

Just as we use electric field lines to represent the electric field created by charges, we can draw magnetic field lines to represent the magnetic field created by magnets.

就像我们用电场线来表示电荷产生的电场一样，我们也可以画出磁力线来表示磁铁产生的磁场。

The electric field line diagram for a fixed Q that's negatively charged would look like that of a positive Q, but with arrows pointing inward to signify that positive test charges would be attracted to Q.

负 q 的电场线图，类似于 Q 图为正，但测试电荷被 Q 吸引。