Helmholtz coils

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Helmholtz coils

A pair of flat circular coils with equal numbers of turns and equal diameters, arranged with a common axis, and connected in series to have a common current (see illustration). The purpose of the arrangement is to obtain a magnetic field that is more nearly uniform than that of a single coil without the use of a long solenoid. The optimum arrangement is that in which the distance between the two coils is equal to the radius of one of the coils.

Helmholtz coils separated by distance r , resulting in a nearly uniform field of point P enlarge picture
Helmholtz coils separated by distance r, resulting in a nearly uniform field of point P

Helmholtz coils

[′helm‚hōlts ‚kȯilz]
(electromagnetism)
A pair of flat, circular coils having equal numbers of turns and equal diameters, arranged with a common axis, and connected in series; used to obtain a magnetic field more nearly uniform than that of a single coil.
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References in periodicals archive ?
In this method an externally controlled uniform magnetic field of a Helmholtz coil is applied parallel to the horizontal component of the Earth's field.
A Helmholtz coil set was placed around the magnet, with its symmetry axis parallel to the Earth's field and with the magnet at its center.
Writing the uniform magnetic field B as the sum of an externally controlled Helmholtz coil field [B.
The frequency of oscillation of the magnet was also measured for various currents in the Helmholtz coil with the length of the string kept at [L.
The Helmholtz coil axis was aligned with the horizontal component of the Earth's magnetic field.
For the Helmholtz coil that is used for the experiment,
Helmholtz coils in one axis are consisted from two identical coils with defined radius R.
Practical method of improving the uniformity of magnetic fields generated by single and double Helmholtz coils.
We can use also this substitution: the center of Helmholtz coils is placed in distance x, which is equal to R/2.
Key words: Helmholtz coils, uniform magnetic field, COMSOL simulation, magnetic measurements
The whole construction is made of electrically and magnetically non-conductive materials, that allow using of Helmholtz coils for AC applications.
Uniformity of magnetic field inside Helmholtz coils was measured during first part of our experiment.