We have the cross-product of the position vector to this point times the force.
我们用这个点的,位置向量,乘以这个力。
Hopefully most of you know that the electric field is a vector field that basically tells you what kind of force will be exerted on a charged particle that you put in it.
希望大多数人都知道电场是向量场,电场描述了,对场中的带电小颗粒的力的作用。
You know.. it’s not the length of the vector that counts… it’s how you apply the force
你知道……不是向量的长度决定……是你用多大的力决定。
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