Quadrupole Magnetic Field
四极磁场
Two properly spaced coils with currents in the same direction can produce a useful magnetic field geometry in the Helmholtz coil arrangement. Also useful is the arrangement obtained by reversing one of the coils to produce a magnetic quadrupole field.
两个适当间距的线圈，若电流方向相同，可以产生有用的磁场几何结构，用于赫尔姆霍茨线圈排列。另外，通过反转其中一个线圈以产生磁四极场的排列也是有用的。
| Make currents in same direction: Helmholtz coils
方向相同：亥姆霍兹线圈 |
| Magnetic field plots
磁场图 |
Magnetic field concepts
磁感应强度概念
| HyperPhysics***** Electricity and Magnetism
HyperPhysics ***** 电学和磁学 | R Nave |
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