Materials are classified as magnetic or nonmagnetic on the basis of whether or not a force on the substance owing to the presence of a magnetic field.

根据由于磁场存在时是否有一个力对物体发生作用而把材料划分为磁性材料和非磁性材料。

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When a charged particle is in a magnetic field, it tends to travel along that field's lines of force, spiralling as it goes.

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。

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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.

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。

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The coil is suspended in an external magnetic field and the current running through it adjusted so that the attraction between the two magnets balances the gravitational force on the suspended mass.

ECONOMIST: Weighing a kilogram