Helmholtz Coils
海姆霍尔茨线圈
A useful laboratory technique for getting a fairly uniform magnetic field is to use a pair of circular coils on a common axis with equal currents flowing in the same sense. For a given coil radius, you can calculate the separation needed to give the most uniform central field. This separation is equal to the radius of the coils. The magnetic field lines for this geometry are illustrated below.
一种获得相对均匀磁场的有用实验室技术是使用位于同一条轴线上的两个圆形线圈，且电流方向相同。对于给定的线圈半径，你可以计算出使中心磁场最均匀所需的线圈间距。这个间距等于线圈的半径。这种几何结构的磁感线如图所示。
The magnetic field on the centerline of a current loop can be calculated from the Biot-Savart law. The magnetic field from the two loops of the Helmholtz coil arrangement can be obtained by superimposing the two constituent fields.
电流环中心线上的磁场可通过毕奥-萨伐尔定律计算。通过叠加两个构成磁场，可以得到亥姆霍兹线圈 arrangement 的磁场。
| Reverse one coil to get a magnetic quadrupole field
将一个线圈反转以获得磁四极场 |
| 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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