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• Time of issue:2020-10-14 13:06
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(Summary description)The Helmholtz coil is a device that generates a uniform magnetic field in a small area. Due to the openness of the Helmholtz coil, other instruments can be easily inserted or removed, and visual observation can also be performed directly. Therefore, it is a frequently used device in physics experiments. Named after the German physicist Hermann von Helmholtz.

The Helmholtz coil consists of a pair of identical circular conductor coils. Using a rectangular coordinate system, the central axis of two circular coils with a radius of R is coaxial with the z axis. The z coordinates of the two circular coils are respectively sum, and each conductor coil carries the current I in the same direction.

This setting can minimize the inhomogeneity of the magnetic field at the center position O (or origin) of the two coils. This operation prompts and also means that the leading non-zero differential term is. This parameter will be explained in more detail later. However, doing so will still leave an approximately 7% difference in magnetic field value between the intersection of the coil plane and the z-axis and the O point.

In some applications, Helmholtz coils can be used to offset the earth's magnetic field, resulting in an area close to zero.