Quadrupole Magnetic Field

Two properly spaced coils with currents in the same direction can produce a useful magnetic field geometry in the Helmholtz coil arrangement. Also useful is the arrangement obtained by reversing one of the coils to produce a magnetic quadrupole field.

Make currents in same direction: Helmholtz coils
Magnetic field plots

Magnetic field concepts
HyperPhysics***** Electricity and Magnetism R Nave
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