Helmholtz coil
Two circular coil device which creates a homogeneous magnetic field
Helmholtz coil
A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists of two electromagnets on the same axis, carrying an equal electric current in the same direction. Besides creating magnetic fields, Helmholtz coils are also used in scientific apparatus to cancel external magnetic fields, such as the Earth's magnetic field.
Read on Wikipedia · Image Unidentified Brookhaven National Laboratory employee, Public domain
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