They can be charged more quickly by using an electric charging point, Pradelli said.

普拉德利说，通过使用充电点，它们可以更快地充电。

If a positive test charge were placed directly between the particles the force exerted on it would be in the same direction that the electric field points toward the negative particle.

当在粒子之间放置一个正测试电荷时。 力的方向是朝向负粒子的场。