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 ?
Tenders are invited for Supply of Magnetic moment by using a pair of Helmholtz coil qty : 3
Design of a helmholtz coil for susceptibility testing using variational calculus and experimental verification," IEEE International Symposium on Electromagnetic Compatibility, Vol.
For this reason, the Helmholtz coil is considered a standard and produces a magnetic field whose accuracy is governed by the accuracy of the current monitoring equipment.
Magnetic Field Uniformity around Near Helmholtz Coil Configurations.
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.
The researchers altered the magnetic field for half the bats at night, shifting it from north to east using a Helmholtz coil after the sun had completely set.
Color brochure details a full range of Helmholtz Coil Systems for applications such as magnetic immunity testing, Earth's field cancellation for biomagnetic studies, CRT adjustment, navigational equipment calibration, magnetoresistance measurement and Hall probe calibration.
Tenders are invited for Supply of e/m ratio using a pair of helmholtz coil kit electron diffraction experiment kit
The setup is essentially the same as described in [2], the most important changes being a massive water-cooled Helmholtz coil of 50 cm diameter with the interferometer at its centre and two layers of Mylar (1) foil between the coils' body and the interferometer.
Tenders are invited for Supply of 3 Axis Helmholtz coil System
Firester, Design of square Helmholtz coil systems, Rev.