By using simple experimental apparatus, this problem investigates the nature of the magnetic braking force quantitatively.
该题利用简单的实验装置定量研究磁刹车力与相关参量的关系。
Rotating magnetic field is not caused by mechanical methods, but in AC pass in a few of the electromagnet, the nature of its magnetic cycle of change can be seen as rotating magnetic field.
转动磁场并不是用机械方法造成的，而是以交流电通于数对电磁铁中，使其磁极性质循环改变，可看作为转动磁场。
By placing our bodies and environments in alignment with the magnetic axis, we can think and act more in tune with nature.
把我们的身体和环境都在磁力线与轴我们的思想和行动更加符合性。
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