当一个带电微粒在磁场中时，它会倾向于沿着磁力线螺旋运动。
When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.
现在问题是，理解这两个场是怎样,由在其中的带电微粒生成的。
Now,the question is we need to understand how these fields themselves are caused by the charged particles that are placed in them.
这个力会产生这样的作用，有一个运动中的带电微粒，磁力会使其轨道偏转，并在磁场中做旋转。
And that force tends to cause it, if you have a moving charged particle, to deflect its trajectory and start rotating in a magnetic field.
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