他把几块磁铁合并起来加强了磁力，儿子说他知道这正显示了磁铁的磁场。
He was using several magnets together which compounded the effect. He said that he knew it was a demonstration of the magnetic field of the magnets.
如上所述，两个磁场的磁力线相互平行且方向相同时，就形成了一个加强磁常。
As is mentioned above, a strengthened field is created where the lines of force in the two magnetic fields are parallel and have the same direction.
如上所述，两个磁场的磁力线相互平行且方向相同时，就形成了一个加强磁常。
As is mentioned above, a strengthened field is created where the lines of force in the two magnetic fields are parallel and have the same direction.
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