Helmholtz coil

noun
Helm·holtz coil | \ ˈhel|mˌhōlts , ˈheu̇| \

Definition of Helmholtz coil 

: one of two equal parallel coaxial circular coils in series that are separated from each other by a distance equal to the radius of one coil for producing an approximately uniform magnetic field in the space between the coils

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History and Etymology for Helmholtz coil

after Hermann L.F. von Helmholtz †1894 German physicist

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